Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c26525a0503ae0…

MALICIOUS

PDF

69.1 KB Created: 2021-04-02 05:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1e3df4104ee61145c846e4e2b4b873ff SHA-1: 7172c2195c06ae32c7d6a025b6dbb0c2d9124ca6 SHA-256: f6c26525a0503ae0c592ba4a2603802fdb325e47eb2d07238742d6b5ecc992b3
194 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. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/award?keyword=ahmad+shah+abdali+pdf+download PDF link annotation
    • https://cdn.sqhk.co/tiwefuxab/ZS6fpgi/withings_baby_scale_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/hgBjh8C/82218194716.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/jcjgdyD/84762796993.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/0Kkgdji/talking_angela_chat_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fonazovep/wgShapd/fishing_hook_knots.pdfIn PDF document text
    • http://stassikorskyi.com/298079213372n5y5.pdfIn PDF document text
    • http://money-team.site/88461449213pzdcm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukoxaji.rf.gd/fatuporulefarek.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_6d5cdb3f20f846419d9892d0ded964d9.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_8eacc9f405854c548165d0e101a7f910.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/daforotukepiwefuk.pdfIn PDF document text
    • https://a1caaca2-2281-43ca-b2b5-e8dcf6f2a4ec.filesusr.com/ugd/c6e36d_a573cf3698724753a129a5dab845e43e.pdf?index=trueIn PDF document text
    • http://givobipuxox.rf.gd/77910680409.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/nedixife.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_269f702c254d4d77853800d08b5b93ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokelur/81597165571.pdfIn PDF document text
    • http://xivubijorudi.epizy.com/buttonhole_deformity.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/63885157601.pdfIn PDF document text
    • http://pubexet.rf.gd/add_it_up_violent_femmes.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/xapitimotaxegojof.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_cbb1b3d1990e4a7e937a12c1007c5312.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_e09c1860a7514eaa8495b660199da68d.pdf?index=trueIn PDF document text
    • https://c0add167-8731-41f0-9a7b-3d62f09b0499.filesusr.com/ugd/879476_d3a60f855822410ca658bea388c82eee.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_off0000d1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 5408 bytes
SHA-256: f8631b6b6b40dc475e8acef36387f2435089d487dda6cfede28f0e77df619f99
font_01_sfnt_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 10100 bytes
SHA-256: 242574d44c23109d51e718c39b410a4b720439a7c038de73b0cf424afe28364f