Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb64766b7e130270…

MALICIOUS

PDF

79.5 KB Created: 2021-03-09 02:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f13e8fcc0432a5b91d089438fac25c36 SHA-1: 1f7eea5eeac4e1b23cc48531251c9ee742b1783a SHA-256: cb64766b7e1302708f37ab64c1f532f689becd7960e88a60c6297296bcc54988
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://botokaw.ru/123?utm_term=future+tense+exercises+with+answers+grade+7 PDF link annotation
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/wexepisejefotoj_libeninaxoziwev_kifinud.pdfIn PDF document text
    • https://tasototunone.weebly.com/uploads/1/3/4/7/134755659/6712816.pdfIn PDF document text
    • http://shop-you.xyz/sagurumanudv8oh0.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/3398141.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5ffdc320bd06e.pdfIn PDF document text
    • https://vatedubajepe.weebly.com/uploads/1/3/4/3/134371970/xopavi_budedejeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476140/normal_5feb20d916232.pdfIn PDF document text
    • https://bifuvabomefu.weebly.com/uploads/1/3/0/8/130814245/6597624f911f7a.pdfIn PDF document text
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/e5b318.pdfIn PDF document text
    • https://gikexirubunos.weebly.com/uploads/1/3/4/6/134644737/9531924.pdfIn PDF document text
    • http://cafe-cok.ru/el_profeta_khalil_gibran_resumen_por_capitulosrcwcf.pdfIn PDF document text
    • http://zatoboyvibor.fun/std_10_social_science_navneet_downloadrkvvj.pdfIn PDF document text
    • https://wivozodibadire.weebly.com/uploads/1/3/0/7/130775536/1864676.pdfIn PDF document text
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/jovubepuzusesuni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_42a1d3bf5e194fedbe58e6b0b0c71e1d.pdf?index=trueIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_f768a62a56ca44c89d40163273770646.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_d06543870dc846feacfc3542ed7580e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46157547-1458-44d5-8afc-b4030cab3376/central_pneumatic_6_gallon_1.5_hp_150_psi_air_compressor_parts.pdfIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_8bc38a08e6664203a5c16c6458c63f12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c44efdc-99d8-4145-847c-fe2af011bee7/figadurusizebefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbbb20c0-2150-4cf2-bcfa-790981463f91/56226625197.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_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 5364 bytes
SHA-256: 6fa1b1a63a746273387a5ad15fea69681f175d8cdbafd56e390ee3637893eef5
font_01_sfnt_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 10464 bytes
SHA-256: d99cc48f46160f71f68fcc6226128f4d9322fa9642e03d3a311ccdb5ae60f710