Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80d29d998ddd037…

MALICIOUS

PDF

95.5 KB Created: 2021-03-04 18:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5865e747512f87b4bd5127fbe8c02b3d SHA-1: f570dc5a98b38eb95ba82b67f5653b84551a9884 SHA-256: b80d29d998ddd0373288f6de60f5ba6f98dcf8ff52ee581c542c71ed916db6ba
186 Risk Score

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 distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document likely used as a lure, potentially for spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/award?keyword=present+perfect+exercises+for+grade+4 PDF link annotation
    • http://winoraama.website/mcgraw_hill_kindergarten_math_workbooks3da9b.pdfIn PDF document text
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/7013571.pdfIn PDF document text
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/6350386.pdfIn PDF document text
    • http://vwwv-avito.online/us_history_questions_and_answers_easy70qom.pdfIn PDF document text
    • http://gatorama.fun/49395510844xpv9l.pdfIn PDF document text
    • http://digitalcalakk1.xyz/55771966708ql7zz.pdfIn PDF document text
    • https://zazafiwizodizi.weebly.com/uploads/1/3/4/0/134041258/1cf39b2b0.pdfIn PDF document text
    • http://ridunculus.com/582078884788pae7.pdfIn PDF document text
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/cfb10656dab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_200f9af4bed147aaa1acad220ac6fd1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23560cfa-3c35-4938-a148-d1c276620db8/gokameropedap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee48bde8-8994-48cc-8c0b-13f786128ade/is_a_volvo_xc90_reliable.pdfIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_e852ab3d8fb64759bd82db3a36600f41.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a9b0eaa65b234a8c838db66aa3709576.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b151b89-0a5a-476b-a29d-f8dc5101f0f9/which_exercise_is_best_to_reduce_back_fat.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_ae654a1dd4ad454d9d083811b06bad42.pdf?index=trueIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_ee040952be0149f49e467b1f479fc3d4.pdf?index=trueIn 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_off00013a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7D 5448 bytes
SHA-256: 6c0140cbc678b64fbc1a2bf449fb9ef98bee3c048dc8653d410f814c15cb270e
font_01_sfnt_off00014d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1B 10476 bytes
SHA-256: 78201e5ceff7971576ab2628b071b39dae91412b137ed8e55a7e8b5a07036ca7

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