Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fab7fbf0704b9a…

MALICIOUS

PDF

79.1 KB Created: 2021-03-17 19:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eb05d8ee5b9150e80d8e4ee611096409 SHA-1: d4ab96941c2e569b402396843aa91e1a8fcd5344 SHA-256: a2fab7fbf0704b9ac0ddd34c75869e2b4e08f6d024c9f0f9247850cd94813d39
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://golowaki.ru/wix?keyword=lifetime+fitness+rochester+hills+pool+hours', is likely part of this scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=lifetime+fitness+rochester+hills+pool+hours PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427529/normal_5feb72d60e24b.pdfIn PDF document text
    • https://mebifexet.weebly.com/uploads/1/3/1/3/131381374/wopufe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466659/normal_60095e5e4fe46.pdfIn PDF document text
    • http://juvasojiwal.66ghz.com/forces_and_motion_simulation_lab_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478947/normal_6040bf3b688c7.pdfIn PDF document text
    • https://gapetomoje.weebly.com/uploads/1/3/2/8/132816106/gopeni-gogufuto-pemik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_6040292859b26.pdfIn PDF document text
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/1734796.pdfIn PDF document text
    • https://nirusiji.weebly.com/uploads/1/3/1/4/131407521/9734764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_5fe6884ad8cad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupepiritepax.epizy.com/19011747029.pdfIn PDF document text
    • http://borakenibafet.rf.gd/italo_calvino_best_stories.pdfIn PDF document text
    • http://literukijo.epizy.com/jaremebufawipo.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_698aa92099fa4c3fb1defecdb6f490af.pdf?index=trueIn PDF document text
    • http://sapiwitug.epizy.com/municipal_solid_waste_management_notes.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_499bfeb375f74f8cad6614dd42cefa9e.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_10b9ab7031034604bf1108153c97e182.pdf?index=trueIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_7db14ab33cfa44ca8bcccdf6c9c85d47.pdf?index=trueIn PDF document text
    • http://tuxizowivu.rf.gd/kinok.pdfIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_59736f21a92744bf835da64c9605a4a5.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_0881b14cb1e6426888dde72d000c4c94.pdf?index=trueIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_89dafac8e83a445d8126dd8bcbcb339a.pdf?index=trueIn PDF document text
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_ec44a9d6436148b98540eb7a6ca5e2e3.pdf?index=trueIn PDF document text
    • http://nenilezum.epizy.com/micro_entity_accounts_balance_sheet_explained.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_441e3caf3150401d8803355396d15549.pdf?index=trueIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_366f5bb64daf49e0829e1177888f1828.pdf?index=trueIn 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_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 4988 bytes
SHA-256: 66696ecfe15f5c1277b3273f3087c0303fa60bb27f9cca37be573d3dcb0ad62d
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 11240 bytes
SHA-256: dfa58f083df8ed20d86b42f32020277865db8b4315d0f915a76013b13b0b8018