Malicious PDF — malware analysis report

Static analysis result for SHA-256 543b4bcff7a9b9a5…

MALICIOUS

PDF

75.3 KB Created: 2021-03-11 09:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d6d3ce39989d460a303d7c7b2767ecb7 SHA-1: 1f5d09355710032a18bff58f73ee9775fad4f4d1 SHA-256: 543b4bcff7a9b9a525bcfdf91b45128fcf23c55bbe5001f659ce79340b786220
246 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://seruvukajobal.weebly.com/uploads/1/3/4/4/134479042/rexotolesovujozul.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/wix?keyword=clash+of+clans+hack+android+apk+download PDF link annotation
    • http://edevletorg.com/curse_of_the_werewolves_full_apko639g.pdfIn PDF document text
    • http://dwatches.site/fukulawubdh5df.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/jjgenQM/75531553313.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/exx53We/drift_car_tune_forza_horizon_4.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/gghGzrg/41701524255.pdfIn PDF document text
    • http://muwiduvepobuz.mygamesonline.org/how_do_you_program_a_petsafe_collar.pdfIn PDF document text
    • https://seruvukajobal.weebly.com/uploads/1/3/4/4/134479042/rexotolesovujozul.pdfIn PDF document text
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/wakumumez.pdfIn PDF document text
    • http://lightly.store/xexejezuuz083.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuzofi/NWrhjjb/anatomy_4d_app.pdfIn PDF document text
    • http://reduslim-officialsite.site/pedomakunafipubosagermnhl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedixemalirugi.atwebpages.com/30691700441.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_2db92e659fdb4394a6fac0812c839645.pdf?index=trueIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_f3539ae309044d0ab4f285d3ced22b31.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_c473b8423c3146d89c7fd839c8d0d767.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_4d6ccd26d3cc46859df9a9b674eefcec.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_4611fe03a5294bd89eb4591c27f480df.pdf?index=trueIn PDF document text
    • http://wowutuzineko.myartsonline.com/87035481546.pdfIn PDF document text
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_db874eabae4146bd8ebe5cd67d4bff7f.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_04aa81b0c25045bc93829998ece8aed3.pdf?index=trueIn PDF document text
    • http://titugol.atwebpages.com/92017874477.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_23032e8ce5604a0a98a773da89f5da7d.pdf?index=trueIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_1acb974de7a34672b2028dbb5cb4d5d9.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 5304 bytes
SHA-256: 0b9a0342dc03de281e99203646f893ab68c1f4dbf872bbb550f060b30873250b
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 10176 bytes
SHA-256: d914f30d1a55490f056a280ecb22fa82bb4d26e2b8ec345ad87ee51dd455e855