Malicious PDF — malware analysis report

Static analysis result for SHA-256 572efa43aeddbdef…

MALICIOUS

PDF

75.4 KB Created: 2021-05-30 15:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f50906f33e0258eab1d04271ee9519f8 SHA-1: e2b9f8b296b0e084a980c77315952b848a614ec2 SHA-256: 572efa43aeddbdef831154935c754943472fd45cc68d74ae357285c49dbce728
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The primary external URI, 'https://xezojetit.ru/strik?utm_term=why+did+they+recast+marnie', suggests a potential phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=why+did+they+recast+marnie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366633/normal_603e492b5c0d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480893/normal_60447677c204e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387826/normal_5fec432639744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5fe9d24e312a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405953/normal_5fe0d43799f31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367312/normal_5fe3faf8ecfa1.pdfIn PDF document text
    • https://vudepupebowazuk.weebly.com/uploads/1/3/4/4/134472779/49492b22.pdfIn PDF document text
    • https://romidanunopupef.weebly.com/uploads/1/3/1/1/131163616/mokano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481052/normal_60305a9c5d327.pdfIn PDF document text
    • https://podosutopo.weebly.com/uploads/1/3/4/5/134590637/7017697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_60160d08205d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487409/normal_5ff29850398d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448980/normal_6056619f5bb2c.pdfIn PDF document text
    • https://ruzisatof.weebly.com/uploads/1/3/4/7/134734885/dizenakoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476936/normal_5fd8b0211ca24.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408595/normal_60b3042fb2958.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/5268424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ea5b28-13ff-4f75-8bc1-de11910d3ad3/what_does_the_bible_say_about_the_news.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62e062d-8fa0-442f-af06-9061e2bd9ad7/beweguvodibinaxewizimik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548e5a2c-1cbf-4c2c-a40b-284116f8db54/ap_language_and_composition_sample_test.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_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 5264 bytes
SHA-256: 09fc6c4949aff392142b3d43fce400faade6eb70b6ded872352a06b3c7652b7a
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 10540 bytes
SHA-256: c264fef6a9207561381b55726278963a8644c23a3a6b9e95d8703e6c70aefe11