Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b9111463ded342…

MALICIOUS

PDF

108.8 KB Created: 2021-03-12 15:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ecce68d5c9fe3c228e1156aeb89ee2ad SHA-1: b63cb0c48b65022699bfe52672ee07732f403223 SHA-256: 35b9111463ded342312f02fbc4dc71c41a15781871989a148c05e24f8e2886ac
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. It contains numerous external links, including a redirector URL, designed to lead users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to manipulate search engine results or distribute phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/123?utm_term=blunder+synonym+informal PDF link annotation
    • https://cdn.sqhk.co/gabixeme/gfehjmP/84369403412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_601fcb8e29965.pdfIn PDF document text
    • https://cdn.sqhk.co/bodosuruwalu/fGghbha/45893702042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412607/normal_603050e06f6bb.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/iegc4he/colorblind_counting_crows_lyrics_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/xiponamoribo/2548bjf/norebovatoratipex.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/iK2enhc/gizidoxajixesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498678/normal_5fd165138e361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452199/normal_603aa67ed9032.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_5fe18397b1994.pdfIn PDF document text
    • https://cdn.sqhk.co/xazururoxe/gcQFEij/sam_commander_arena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_60223f20bf4c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5fdb8173ee0bb.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/2jcjfos/xajimelezumaboduwufazodax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_604a41e61b182.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/dT1cy4n/valefetulitigax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420764/normal_5feb07f1d892c.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/zghRij7/collage_maker_mac_os.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/najugamaf.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/maytag_bravos_mct_washer_reset.pdfIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_b428a35d81ce4666bf4cc3621cfc5388.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/how_do_i_access_my_verizon_cloud.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_9d67c1cb97d0487aaaf10eb9b2c4f292.pdf?index=trueIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_00856147c705441fab79f9c700b025e9.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000185b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x185B7 18212 bytes
SHA-256: 3dbadd64437a7b03b741b4d6b5bca5b9a680fed71a3f11be83d1a02cbc16d13e
font_00_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 22208 bytes
SHA-256: 2e815dd15a36e55181a5dab9f0792b67d96225a080f408a6477d61bae47ff2ad
font_01_sfnt_off00013783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13783 5204 bytes
SHA-256: f875a9d63576b558a6e989d5297243bad19f913bad4d471e594aff8affcdb13c
font_02_sfnt_off0001491d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491D 8448 bytes
SHA-256: 3613dddae3c7c7559ff668df0c8856a00d622f4aa95ab281947b5eb0328211ce
font_03_sfnt_off000160ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160CE 11232 bytes
SHA-256: 1040207c69b7c4dd7ebd62f233a43c1f48adaca8638c4ef0829ed213411fc089

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