Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6ab940392eb586…

MALICIOUS

PDF

90.4 KB Created: 2021-03-07 14:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f6ba7c46a41eb4da7686a6865195d3fc SHA-1: 4ff7e0361939fd402b9e75851f09929218d66960 SHA-256: 0a6ab940392eb58653030a9a103d4f53166ac2d6e0f3b6eecdcc4a74b39aac05
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links pointing to various PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary external URL observed is https://fokemale.ru/wix?keyword=lattice+energy+practice+problems+with+answers+pdf, which likely serves as an entry point to this network of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fokemale.ru/wix?keyword=lattice+energy+practice+problems+with+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/lubometusoz/jLJR8fw/komozatusolixak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366976/normal_5fe592eca36ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_5fd93be759ccf.pdfIn PDF document text
    • http://kovefubiwajulo.22web.org/adblock_plus_for_safari_mac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_60267721b294b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501961/normal_603a4dc01b176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461767/normal_600c8a414db0d.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/ee1CGVA/wuwamitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419413/normal_60010347ed717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_5fd3c9344097b.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/BZjirg6/sapug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484114/normal_5fcc0009e4a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401525/normal_600bbd53cda88.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojiwifi.epizy.com/persian_pronunciation_guide.pdfIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_c8b807ce09e8444995058a3708ede30f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c4aa38-580c-48d3-b923-a3e7f94a8c71/bituxufab.pdfIn PDF document text
    • http://bezepegu.epizy.com/nutar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0512eaa5-37be-415e-a89a-c8f78c3072bf/novafodafosunorigija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5aee74-c1ab-42e9-879c-6480f4850532/what_extra_books_does_the_catholic_bible_have.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_726a3233a6fd4120908d83f5e4364424.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_d33968026d8b489f8397fee425ea6ece.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4e0181-b539-49b3-a522-b27831cff94e/40933013399.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 2224 bytes
SHA-256: 7a8abc0172416555a389c384235fa92489e7703335fba94c96abf7fe8a23a274
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 5844 bytes
SHA-256: b96cd9fe20bc807e8ea662ddc039852f4a308376bcd3f0868c58fc89eff58f99
font_02_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 15100 bytes
SHA-256: af195708705d21de797c48d2ca5dc866066b1d7736cdf1223dd9f829d616de41
font_03_sfnt_off000145e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E1 16132 bytes
SHA-256: 6820151f9a4816bccc9e85e605aef44ce22c8924dfcccd161584754f275bf028

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