Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf182c1342d9316…

MALICIOUS

PDF

78.1 KB Created: 2021-03-20 11:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1f6ad019eda8ecaeb0573972f6ae93ed SHA-1: 23748af937adc40607697cbc8c0083fbc9697521 SHA-256: 0cf182c1342d9316e1e0569e6ecd99a1a2960520e877f92835c9db41de5ef5b5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a high concentration on disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the structure of the PDF point towards a spearphishing attachment, likely designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://midufefew.ru/strik?utm_term=arturia+minibrute+analogue+synthesizer PDF link annotation
    • http://tabagobadirab.iblogger.org/mebuxagumato.pdfIn PDF document text
    • http://instapriz.online/hope_you_are_doing_well_formaltjhe1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490369/normal_5ff892e04e375.pdfIn PDF document text
    • http://zunurefiz.22web.org/dekusefajubikapakujugol.pdfIn PDF document text
    • http://letilemugemin.66ghz.com/policy_argumentation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420592/normal_600212dd6c6ea.pdfIn PDF document text
    • http://bravos-kids.ru/vunololuuunuy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459935/normal_601614421ecda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_448c5341398a4a05baadea67f1da8e7b.pdf?index=trueIn PDF document text
    • http://tanikotik.epizy.com/biostatistics_carter_center.pdfIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_0f1218d355504bbda8a118475ec497fd.pdf?index=trueIn PDF document text
    • http://mamepekavileput.rf.gd/jugurigenusisikarame.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_efa48cc7fcb74933a668a0c678ee0a0a.pdf?index=trueIn PDF document text
    • http://xuzetiseke.rf.gd/20767390110.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_e989d722ab574e9b8cce2e2566dd40db.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_71981b0c12534779afd890674724fb29.pdf?index=trueIn PDF document text
    • http://piserujirabubam.epizy.com/10689408646.pdfIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_170cd69c4efa4e6bb98687d26c0ae246.pdf?index=trueIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_dbb9667bd1ff44d9930ac8d38b1cab3a.pdf?index=trueIn PDF document text
    • http://buxidogekalor.rf.gd/4537867546.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_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 5380 bytes
SHA-256: 823996845b446c3bc114bd62caa5f438ed8218072259a0af94b24174ce5dcadd
font_01_sfnt_off00010205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10205 11972 bytes
SHA-256: 0b60e35184c551b988cd19d045372bc7fb6ddecbff32898eaed13a82fa82bc85

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