Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6f92c5cd3066db…

MALICIOUS

PDF

82.9 KB Created: 2021-03-05 11:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 34b240498c1534f2b1bf5bffbef52b8f SHA-1: 5b7ec0584c33128ca5186dd61eb490b981a0cce3 SHA-256: 7e6f92c5cd3066db9bab2a2b1f20dcc6542acaaf7fa0625d11ac58e0da3de34c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a phishing or malicious redirection scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=how+to+cite+words+from+a+poem+title PDF link annotation
    • https://siromalad.weebly.com/uploads/1/3/5/3/135312661/sizesaravokesifuwul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_5fe8f1a461eb4.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/42844443247.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/baby_stories_during_pregnancy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_601f0c9eac6de.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/rhetorical_question_grammatical_definition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421209/normal_5ff3026b855df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447663/normal_5ffb9141247c3.pdfIn PDF document text
    • https://xaviguvugunaji.weebly.com/uploads/1/3/5/3/135313722/4726491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383921/normal_5ffdd88ea8dab.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/55511344586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_602df3044df13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_60353cd32377b.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/periodic_table_worksheet_answers_define_a_family.pdfIn PDF document text
    • https://vigajinid.weebly.com/uploads/1/3/4/8/134889024/xumumogusuzovefabeko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_c11f1acdc9794d4fa81e0fe08d3b2cfe.pdf?index=trueIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_90ff6fdcd8d54b66ab40fe9401ca5a51.pdf?index=trueIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_22521f6ad0a04dfca576af5cd999014f.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_16d503d5848942fab5c1a7ea931dd392.pdf?index=trueIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_dc3126b02f8d4927a10ea6d65c495dd8.pdf?index=trueIn PDF document text
    • http://nowimirozox.atwebpages.com/42147966697.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 5356 bytes
SHA-256: b8fadae95bb706f896c7909dbe52242eec159621fde79f4d075194605925102b
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 10640 bytes
SHA-256: c1ddf6189665068048eb99c974bcea8364de745bb2b439b947ec36e20f40069b
font_02_sfnt_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 16088 bytes
SHA-256: 67bcfb7c388726f5c3b45134396d4daeb52989b52d679508e6f393a01196499c

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