Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0f49214d0fa85d…

MALICIOUS

PDF

73.4 KB Created: 2021-06-03 00:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 22a84b518bbdafbca90c37e47b84db55 SHA-1: 53a10e5e9effd44396e545554ce2029afa97eede SHA-256: 5c0f49214d0fa85d969d6b7c588a9b77d3804afa149e72a53a8a4e1836b33281
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a tactic to manipulate search engine results or distribute malicious content. One of the embedded URLs, 'https://laborke.ru/pbw?utm_term=which+penny+stocks+to+buy+today+in+india', is a primary IOC. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://laborke.ru/pbw?utm_term=which+penny+stocks+to+buy+today+in+india PDF link annotation
    • https://dakezevowefop.weebly.com/uploads/1/3/6/0/136088489/4920981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_60558bcd4b47c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427795/normal_5fff9c38b16ab.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/79497cb.pdfIn PDF document text
    • https://bivesezuwewosup.weebly.com/uploads/1/3/4/7/134765681/xikijegavadad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_6060195a0ebb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_602b47d85eb2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447107/normal_6011e52dd0bd6.pdfIn PDF document text
    • https://visosoduvevup.weebly.com/uploads/1/3/4/2/134234588/numujujisulu-kijipesag-zufokexi-fakogeru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443802/normal_5fe5e1a40a5fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451019/normal_6009d20a41e9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_60684463cb5e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5fcee1442490d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_601cad047946f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_6024ff2e7673d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_60417ff8b3337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_603b369e096d7.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/a142a6ce-a5f1-4548-b368-da6d14a4cee1/how_to_run_a_lathe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17d2089-1def-4ea3-8c0e-e73eb764dfa7/41970584319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/661e2f10-0e8a-4a64-be67-a3c526c2cf96/what_does_becks_cognitive_therapy_focus_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa6d396-07b5-471e-b155-def3fa1f07a7/13726330822.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_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 5352 bytes
SHA-256: 28209122d3d88bf355ecb2084b018b54520ce7a3b07c5fc113a751fd1eef8e92
font_01_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 11032 bytes
SHA-256: e5d3d00d3d44b7f1940921f05249f6c0aa3690f75f78d449b19840ecc6ca8742

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