Malicious PDF — malware analysis report

Static analysis result for SHA-256 4585ecf1a81d34aa…

MALICIOUS

PDF

75.9 KB Created: 2021-03-01 05:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4dce272481173c5d61a57ce6b93a3768 SHA-1: 8f702215b4c5cc57d77840444d9c3379db0eadfe SHA-256: 4585ecf1a81d34aa21775f7b354f7a19bf261ac2b812d765a9e3fcc19136a56e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable hosting domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO spam or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used in phishing and malicious content distribution.

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://jottigo.ru/award?keyword=rainbird+5000+sprinkler+head+adjustment+tool PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391314/normal_5fc880679c4ed.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/16809560602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406771/normal_5fefd9ac4f8c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_602fc503eac21.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/53689841481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_6010b1b1133ca.pdfIn PDF document text
    • https://zigapugulila.weebly.com/uploads/1/3/0/7/130776078/legetofimaxub_tixarikimoxupok_givime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_600da0a002b8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453732/normal_600c22a2c35f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369318/normal_5fe35899016b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502567/normal_5fe1431f13d5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_602a2d781a139.pdfIn PDF document text
    • https://vafoguvisijun.weebly.com/uploads/1/3/4/8/134887412/d4a2ee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_60316a260389c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gaxodusipif.epizy.com/74854863837.pdfIn PDF document text
    • http://rixigor.onlinewebshop.net/introduction_to_post-quantum_cryptography.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 5636 bytes
SHA-256: f8b6cfea8d816cbd8bd209f918d8796bdeb98993ac3023fb7f6ef4c70c99768e
font_01_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 11104 bytes
SHA-256: 8e1b6e1c59438a4586051ff08bcf9158ff3650c6a85d0c274858e5aa4431a836
font_02_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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