Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20abae6b265abbc…

MALICIOUS

PDF

73.3 KB Created: 2021-02-20 10:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d05195c0254a5b9d1059d35765fd6ffe SHA-1: 01bf65c4b7f162a4d6d820f199a6f4c81d04d073 SHA-256: d20abae6b265abbcefd18fae7ea71fe25bc16704fe16ec2ebe5bc6c7b4e4fbb6
186 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of external links and the phishing/trojan detection strongly suggest an intent to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=philosophy+books+pdf+grade+12 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5ffc4dda6ab01.pdfIn PDF document text
    • https://bimuwosexiwo.weebly.com/uploads/1/3/1/1/131164043/wolefa.pdfIn PDF document text
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/0ee1a9772d4dcc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468828/normal_6000f6a14dc2e.pdfIn PDF document text
    • https://puruvafapazono.weebly.com/uploads/1/3/0/8/130815059/32b4fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405642/normal_5fd28813e26e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408718/normal_5fdbd29f2b0a5.pdfIn PDF document text
    • http://onlinetyz.xyz/nelifimwqryk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_5fd3b2649f5c1.pdfIn PDF document text
    • https://jugatevos.weebly.com/uploads/1/3/5/3/135344520/fezaluzovotom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_601f6527de984.pdfIn PDF document text
    • http://tetutunugu.iblogger.org/protoplast_culture_and_somatic_hybridization.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488604/normal_5fe57af71204f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fejukuvazov.rf.gd/have_to_esl_worksheet.pdfIn PDF document text
    • http://lekekavom.epizy.com/42961822997.pdfIn PDF document text
    • http://vowaderisosalel.epizy.com/derevitinixexuwavojip.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_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 5796 bytes
SHA-256: bfac3fb39b0710e8407af9bd8e2efa2bd740e2af302057acfa2b9dac0fec6123
font_01_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 10608 bytes
SHA-256: 7ed43661f0efbeff71c70e83a6f0aea7c934ecd0411eff892147ec2159f082aa

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