Malicious PDF — malware analysis report

Static analysis result for SHA-256 b912c36da7f9f9c3…

MALICIOUS

PDF

82.2 KB Created: 2021-03-23 23:19:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f3b0ce7d8568f97074b44be68fd82a16 SHA-1: d158547efe84320b7e5ebfa0c9c0238fefaed873 SHA-256: b912c36da7f9f9c39189871da1e25bc7cf782f5b2d0ebcf53172b67cd90b633a
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as an SEO link farm and redirector, likely to distribute phishing content or malware disguised as downloads. The embedded URLs point to various PDF files hosted on external domains, suggesting a campaign to generate traffic and potentially trick users into downloading harmful 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://jacksth.ru/wix?keyword=go+simulator+apk+2019 PDF link annotation
    • https://cdn.sqhk.co/xesoralo/hbgdnJE/apollo_munich_optima_restore_rate_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/juxefirapuf/bhh0Xii/didatubokijarona.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/YRcjiyT/international_superstar_soccer_3_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvonazavo/HxjbmMt/flat_pack_houses_for_sale_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/jggiwaN/17480806699.pdfIn PDF document text
    • https://modevidiwuwos.weebly.com/uploads/1/3/5/3/135318048/1ee5fb403.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/EicLiev/najikaraxalizavoza.pdfIn PDF document text
    • https://cdn.sqhk.co/virapazetif/adId8ji/iihf_world_juniors_2017_usa_roster.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/gPjgxge/aquarium_fish_tank_acrylic_divider.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/hgtHjiD/kirudoxegumibuzejolavod.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/04645860a.pdfIn PDF document text
    • https://cdn.sqhk.co/lopokevofoti/iawwTii/license_plate_check_uk_free.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/jjShhji/srs_fire_protection.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/Y0hYhhs/simple_black_forest_cake_design.pdfIn PDF document text
    • https://cdn.sqhk.co/nijodujex/bggTfhf/classic_cartoon_sound_effects_free.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/iPNwIib/gin_rummy_plus_cheats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 5540 bytes
SHA-256: 45ab2382d6e233c92c3f9e7ffd37fa4069a838322f498051d8c88d8b965a15ab
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 11532 bytes
SHA-256: 994ed2c40f5b4317fd7ab0dcd7d7eb127895856fb5ea7cb3adb23b0d67377ceb
font_03_sfnt_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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