Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf7efc4316e3cc5…

MALICIOUS

PDF

93.3 KB Created: 2021-06-08 21:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e0028e1986a49c8679c2a1e00d2f6bd1 SHA-1: 904169cde586c0621255527f804bdb03310fc0bf SHA-256: cbf7efc4316e3cc58a84d30d1cd1dbc4eb7a1e36d8f40584d6b1e8418377d142
226 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a credential phishing lure. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute phishing pages. The heuristic 'SE_MFA_LURE' indicates the document's intent is to harvest one-time codes or MFA confirmations, likely to bypass security measures and gain unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://catamma.ru/pbw?utm_term=maze+runner+4+kill+order+movie PDF link annotation
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/2235342.pdfIn PDF document text
    • https://dalowosa.weebly.com/uploads/1/3/4/3/134383453/gajokidovi.pdfIn PDF document text
    • https://roluwisotem.weebly.com/uploads/1/3/4/3/134368144/pefopulalofo.pdfIn PDF document text
    • https://pezobarifad.weebly.com/uploads/1/3/5/3/135394950/mavulilujigavuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_6023f44315baf.pdfIn PDF document text
    • https://buputulu.weebly.com/uploads/1/3/0/7/130738697/mumejekulugino-fedoriwunadazu.pdfIn PDF document text
    • https://tazateniko.weebly.com/uploads/1/3/4/8/134885152/figazebizibuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_605a9257f3a9c.pdfIn PDF document text
    • https://vojawozusuv.weebly.com/uploads/1/3/1/1/131164351/65132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381738/normal_5fde85b46f459.pdfIn PDF document text
    • https://seruliwosudaz.weebly.com/uploads/1/3/4/4/134457931/1691899.pdfIn PDF document text
    • https://mevemedetu.weebly.com/uploads/1/3/1/8/131871578/75a26908e15ad.pdfIn PDF document text
    • https://tugagofinose.weebly.com/uploads/1/3/0/8/130874012/nevupamirerovo.pdfIn PDF document text
    • https://gufunemoxopu.weebly.com/uploads/1/3/7/5/137507416/0effa8f.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/25d10717-d1f3-4ddc-8ca9-16d82a54a7e7/79341759006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d8888f-d3f0-45ad-bc96-44be0660e99f/clip_jam_create_playlist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34896555-8639-4acb-a2ca-8dfe14486f01/tubakuvetove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bcc2dde-13d8-4be0-a74a-4f9f8a80cd6c/jlab_jbuds_charging_case.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a601fee8-537d-4c86-baa2-aefe73c2de61/najatapigaxegofanalaxov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3fd284-39ac-415d-8acc-78cf54a50380/wileritoxixuv.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_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 5060 bytes
SHA-256: a471b7c53ece2860c18899b6d85bb3116853bb76e4a53aa0383718ac94ee38be
font_01_sfnt_off000140b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B8 11556 bytes
SHA-256: f991469f17daec6e293d3fd4d7a4c4a900c04a582e79c4e49bcacc9ccf34fb9d