Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac60e9102e4e7cb0…

MALICIOUS

PDF

73.4 KB Created: 2021-04-08 08:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 777a89888b89ad1e709141d959ca63c8 SHA-1: 40b68703b009a14c57d73e33ce34a9398a7aeb2b SHA-256: ac60e9102e4e7cb0e7dce8764779a5f97201ac2ee4b53f4519144fdfa6431a39
186 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a phishing or SEO manipulation attack, likely leveraging embedded JavaScript for redirection or exploitation.

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://pelibifir.ru/strik?utm_term=triton+ii+commercial+sand+filter+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368506/normal_5fe2782fb68ba.pdfIn PDF document text
    • https://goxufosoxewuje.weebly.com/uploads/1/3/5/3/135300646/6a9e914038826e7.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/xuzuginupa_pikoxobire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446770/normal_6031169d6d47b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_605679cac0e04.pdfIn PDF document text
    • http://mynasert.online/what_is_an_example_of_agricultural_revolutionpletz.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/capitalization_and_punctuation_worksheets_high_school.pdfIn PDF document text
    • http://outputqwvk.space/beats_studio_3_wireless_headphones_black_fridayn8hng.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482619/normal_6066aad516039.pdfIn PDF document text
    • http://realnoe-obshenie.online/umweltschutzgesetz_deutschland63kuh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444377/normal_60013e7d2addf.pdfIn PDF document text
    • https://favurujovonelod.weebly.com/uploads/1/3/4/4/134435517/556a1c3635e687.pdfIn PDF document text
    • https://megidawuxuta.weebly.com/uploads/1/3/4/7/134729580/xigoxaninemusuta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_4c280cfb931b43ff9c0fbc5a1d903ce6.pdf?index=trueIn PDF document text
    • http://bonizeza.epizy.com/45897222771.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/books_to_read_together_for_couples.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/tawemukapene.pdfIn PDF document text
    • http://galikamot.epizy.com/xijatodapaxo.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_da840cd4a2cf47d790a17c29793221bc.pdf?index=trueIn PDF document text
    • https://ae40ec61-d20a-40a8-9c94-208d4569f534.filesusr.com/ugd/5d0862_2a100a1f39164d71b6085da73a1ce557.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_7dcd35131edf4ebf842290ac8cfdcc94.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_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 5248 bytes
SHA-256: 3c73987b572b9c1e55423e0bb8dfc4441992db9f69891fc6e977360bf10dc5a9
font_01_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 10716 bytes
SHA-256: c12a724b9d8425af6f9182845377185c7450c5144cf8aff1189a17b580cdde60