Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d8f80654c45209…

MALICIOUS

PDF

153.2 KB Created: 2021-03-31 10:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 27e3448693e9f83d15b594ad55455e94 SHA-1: 222f6d1b26b860327b2918946c57d66a052a95bc SHA-256: 49d8f80654c45209201dfaae1775413abf5199fbb352cd1c202fa260ffebd9f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=nicolas+bourbaki+set+theory+pdf PDF link annotation
    • https://moxusovilala.weebly.com/uploads/1/3/0/7/130738705/14425a6.pdfIn PDF document text
    • https://wopuxikejixup.weebly.com/uploads/1/3/1/8/131856699/e770451196c8.pdfIn PDF document text
    • https://gilepinewuje.weebly.com/uploads/1/3/4/0/134096317/dowupusak.pdfIn PDF document text
    • https://wivixovipi.weebly.com/uploads/1/3/4/4/134442696/8372892.pdfIn PDF document text
    • http://unosital.space/how_many_drops_of_lavender_in_diffuser82o1y.pdfIn PDF document text
    • http://sale-siberian-force.online/how_to_do_binomial_theorem_on_calculatorm2djq.pdfIn PDF document text
    • https://wotakowa.weebly.com/uploads/1/3/4/8/134885303/nagawoniwatazi.pdfIn PDF document text
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/ac4ae49c.pdfIn PDF document text
    • https://furamakivagoj.weebly.com/uploads/1/3/0/8/130814247/4943250.pdfIn PDF document text
    • http://netewe8.xyz/70054940486tcarh.pdfIn PDF document text
    • http://vashastrahovka24.ru/fapomalukezofurikepejujiq8pjq.pdfIn PDF document text
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/cba79e5824a6.pdfIn PDF document text
    • https://luxaxila.weebly.com/uploads/1/3/0/8/130814132/pujexipobefut-podobome.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/6bcde2e2-6d48-416e-b855-86263dd124fd/maravilloso_desastre_saga_cuantos_libros_son.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29a44c9-8a36-4920-babe-25f2ab27d403/gifafizebojugusel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ffba6bb-7164-4b87-b735-3a6c6855c729/matemticas_financieras_jess_rodrguez_franco_gratis.pdfIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_a06354be3fd0487394d5a71ded29214d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2547370c-d56b-4c05-967d-483ac63ed471/83630057542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d28968-792b-4c03-be44-6e33f410a596/switch_steal_unwrap_gift_exchange_free_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7e4607-9e89-4559-b2cd-c7d589aec70d/31288276772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e5c59a8-ec92-41f4-8537-37d27d315a00/70833206598.pdfIn PDF document text
    • https://43e59f28-96d7-4988-bcd6-55bc25f76e69.filesusr.com/ugd/372bdc_f71dedda91ff4b578ebf208e7be1ff08.pdf?index=trueIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_e630f5d4449c4fa7afb2eab410df716b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa6093b-924b-42c1-9205-911c3ac120c3/37504401388.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000201f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201F0 5520 bytes
SHA-256: 1a2ab049997a25979ed555add3cf4adcf62379f36629802506dabcb0c8ee5698
font_01_sfnt_off000214b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214B8 13716 bytes
SHA-256: 1d2a1a5795e6622f593c8843fba71b5b875f3f02233af7f2bf578cc9c6386c6f
font_02_sfnt_off00023faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23FAA 16376 bytes
SHA-256: 41fe88330092a27d9dee1f73e726dbb426cbcd896e8618ba1a06ba25c786e383