Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fa99e0f9605b56…

MALICIOUS

PDF

91.2 KB Created: 2021-04-09 10:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8d9bf9aba4c4e18db4a91561502bcf1 SHA-1: d9eeb85b707910114e8bea195f55c52f3da8fc1d SHA-256: 83fa99e0f9605b56aca96b7d229b14f0b394955a0a3f0eb8947f65eea85a481f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=mtd+lawn+mowers+for+sale
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/33da4bf83.pdf
    • https://rifodajawu.weebly.com/uploads/1/3/0/7/130739776/vurazop-nusuzapi-fakezowexa-sadejodu.pdf
    • http://sportplays.ru/shark_euro_pro_sewing_machine_reviewsal3x4.pdf
    • http://rowaxamapitowej.getenjoyment.net/what_are_the_safe_areas_of_new_york_city.pdf
    • https://razitesewiwi.weebly.com/uploads/1/3/2/8/132815022/5061100.pdf
    • https://duvefotod.weebly.com/uploads/1/3/1/3/131380754/0a8eda5.pdf
    • https://wesulabiduzipu.weebly.com/uploads/1/3/4/2/134235649/982a2f17a.pdf
    • https://gorokawuse.weebly.com/uploads/1/3/4/4/134489158/79a812f9d1cd3.pdf
    • http://tesekiwig.scienceontheweb.net/10044450456.pdf
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/f096d7a76.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • https://xokodozavujug.weebly.com/uploads/1/3/5/3/135343923/zenidafezuvegigojezo.pdf
    • https://rusajilema.weebly.com/uploads/1/3/4/8/134853265/2082647.pdf
    • http://viwafuxofiseko.getenjoyment.net/nejezibenole.pdf
    • http://webpost.pro/stick_ranger_2_wiki7t24s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_2ee5394b507c4c1ca9beac1a29e1ea4b.pdf?index=true
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_14e40473d8da40cb820bfd33894a1a75.pdf?index=true
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_b24777aff6964f6683919b940b8b7737.pdf?index=true
    • http://xevijojikutep.onlinewebshop.net/40026453449.pdf
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_327ea4531f6b4f0b9ab079f04da40959.pdf?index=true
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_43c996c621e14019ad91a6fc8243cdcc.pdf?index=true
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_956f6787394c499eaa57e15f03c2223e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127a4.bin
8c6665b47ad01d4535df96169985f2ebc5be40753b649049e166ba7fd12fbb26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 5152 bytes
font_01_sfnt_off0001392d.bin
1fc9a930d1c8ae49239ba3491ce2492bba3f0002a612a9c91434ff5c30002ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1392D 11412 bytes

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