Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fb2ccb619c2fd5…

MALICIOUS

PDF

77.7 KB Created: 2021-03-18 20:59:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 767a030a4e30432800c51450d486fa53 SHA-1: 25362ab873a995f6df860fa63d714bb2c1dc7550 SHA-256: e3fb2ccb619c2fd5386609383dae85cbe226cd2114621fa4995a9ca4d34e7908
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized content or redirectors, indicating a likely phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a tactic to drive users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=apktool+apk+to+jar PDF link annotation
    • https://cdn.sqhk.co/nozedimasav/hheOjbv/hitman_goty_edition_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/bugabowozi/TwlcvU1/snes_emulator_apk_full_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_60237b2f725c9.pdfIn PDF document text
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/5914005.pdfIn PDF document text
    • https://cdn.sqhk.co/loxakejela/iidIidB/seboxo.pdfIn PDF document text
    • https://xopapirepukonut.weebly.com/uploads/1/3/6/0/136053795/2997123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_605268f856fc4.pdfIn PDF document text
    • http://mijuxub.66ghz.com/39450509590.pdfIn PDF document text
    • https://cdn.sqhk.co/kukusagufo/fCgcWig/49889401542.pdfIn PDF document text
    • http://dexofuzexolan.22web.org/patapakobufamikudurawivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5af0d35-e699-4592-9583-35ea0c757d08/72493260403.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/james_baldwin_the_fire_next_time_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0d0933-3c23-48d6-a40d-f4d05f3db670/nawesileminiwaxafug.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/fleetwood_mac_landslide_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/gibojefaneruwilurexi.pdfIn PDF document text
    • http://junadalolupes.epizy.com/gimp_vs_photoshop_astrophotography.pdfIn PDF document text
    • http://zalowakudedakov.rf.gd/wudodojiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcede2b7-c72e-43fc-8ca5-856cbb82f3de/65872149547.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/xevobatole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f2f7fad-aae2-4b98-b2b4-b304d89e6958/61775898826.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/52895930249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7048d6a-4260-43bd-8b67-5bbb055e51e9/the_song_of_solomon_chapter_7_1-13.pdfIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 4764 bytes
SHA-256: cf1c120ea8ac063c9c916a429c820f14be8596869f2a28011b3a98d000a25b71
font_01_sfnt_off0001035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 11572 bytes
SHA-256: 551d43f066e243cb60e1f2f37c3587df57a0cd719ce7502cab665fc07917fe41