Malicious PDF — malware analysis report

Static analysis result for SHA-256 155111e76dbf938b…

MALICIOUS

PDF

94.1 KB Created: 2021-03-20 10:27:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e309109af5d264c4d88e8c67b3caaaba SHA-1: 4cd9903a4c2f3d799198f75638f35cea7fb524e7 SHA-256: 155111e76dbf938b3cda4bae6bbabbdbdb34fa50dc668f76ea88ad3ad1310b88
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The document body, though truncated and partially garbled, includes metadata suggesting it was generated by wkhtmltopdf, and the primary external URL points to a 'wedding planning' checklist, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://soxebez.ru/award?keyword=checklist+for+wedding+planning+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500429/normal_600ddf4944a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_5fe6f337429d0.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/3bjagft/30808834907.pdfIn PDF document text
    • https://cdn.sqhk.co/gajalalike/jjfhdgf/acid_base_titration_of_vinegar_lab_report.pdfIn PDF document text
    • https://cdn.sqhk.co/kosuxatune/NMoifji/charades_online_game_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_6018686379703.pdfIn PDF document text
    • https://xaroduzorosu.weebly.com/uploads/1/3/1/3/131398324/da8f20c8f661cc.pdfIn PDF document text
    • http://edalovert.xyz/dujidiweselekatomoziojdw0.pdfIn PDF document text
    • https://medijomozu.weebly.com/uploads/1/3/0/7/130775841/wotap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_6020d290e395c.pdfIn PDF document text
    • http://livecopyrightverification.com/52202166270f5xxz.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/mxZrhev/xogozimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443325/normal_6009d19d5ea6e.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/SgeGQXf/jebusekivoxenivokigo.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/73ab6194-f3c1-41b7-939e-48858a035148/cadette_breathe_journey_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ecbbd0-10e5-4168-8278-956f94ef0084/vifidofukatejema.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_off0001304c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 5476 bytes
SHA-256: 4b6ccf0a0b94e293a1f8f776e3b16fff4e0cc3e25a783a082798b2a0cc52917e
font_01_sfnt_off000142fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FA 11568 bytes
SHA-256: 756280fc30cee2721d1aced616fba128d9035d8f95854bb179c01f2e06d7636e

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