Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f9ef89734a9a21…

MALICIOUS

PDF

70.4 KB Created: 2021-06-10 16:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e3ee6d95a313341a3999c8fc199b36b2 SHA-1: b6d4cf33c75912a827d154fae7825c56aca6602f SHA-256: 89f9ef89734a9a214259223fec41936e7f1ccd6b76936b66506837a709b7cf0c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://oniceh.ru/pbw?utm_term=the+whisper+quest+2020 PDF link annotation
    • https://gabamavipe.weebly.com/uploads/1/3/3/9/133999819/jilejuwop_voteg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_60c18ba8a75b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_60631282c388f.pdfIn PDF document text
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/gakubasedevow.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/lajut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_606e104f4d786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391605/normal_600c6330f3561.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/toremazijejibupekex.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/48b1ba7a-7083-48eb-bcb8-cba3ef2ca545/mifeganuwigipodisos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44b0d0d1-c216-4124-858e-31b353c4acea/65034347488.pdfIn PDF document text
    • http://gedelageke.pbworks.com/f/the_philanthropy_of_andrew_carnegie_dbq_answers.pdfIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144444210/lonomigesamasuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159bfe5c-8138-4955-9ce3-35525b4058c7/what_is_polymorphism_in_python.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e8a177-a2bc-419e-9dc6-348ca2be3611/wofidamer.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/wipobogofutamuxelulunebip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7754d558-a827-4367-814e-458041a202f3/how_much_does_a_clinical_psychologist_earn_in_australia.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 5108 bytes
SHA-256: 856e3185a39da3ceca4485d4a1c0fd13eee3fa5d8a18080548982d702ecd54fe
font_01_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 10764 bytes
SHA-256: a9c6ede4c3628303504213a5f69cb31c77c179128aaec20041240a6e59446979

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