Malicious PDF — malware analysis report

Static analysis result for SHA-256 4313238f2b918e30…

MALICIOUS

PDF

73.7 KB Created: 2021-03-28 04:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3a403154dd34d86ce9129d55bd9125a7 SHA-1: e7a189f499effb5fb68e05547dea2e0a6cf6b17d SHA-256: 4313238f2b918e30a5b25421c15473d4833d2eccd9fafe676a650943808248bc
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URL `https://pelibifir.ru/strik?utm_term=bergey%2527s+ford+lansdale+parts` is a primary indicator of this activity.

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://pelibifir.ru/strik?utm_term=bergey%2527s+ford+lansdale+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386824/normal_604cdfbc96726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_601cc281a27ee.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/2e9e49.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/4735407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_6017bb9482227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467318/normal_6004080f74697.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/jji6xje/asphalt_nitro_for_pc_without_emulator.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/59537873252.pdfIn PDF document text
    • https://zosomezo.weebly.com/uploads/1/3/0/9/130969149/resoraruni.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/33839271923.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/the_principles_and_practice_of_auditing_puttick.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/hSghsig/tagunoporetok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_e099d36f126f4486bc908c702ad54721.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3425cb8-0eb3-4891-9bf3-cce232da8c1c/korevawexitikolefebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e775f684-c74c-475e-b670-1fb4495b5a11/what_happens_at_the_end_of_the_martian_film.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_b6594abe15b04ad59ca7c1fe789c2704.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0c77d7-79a7-4112-afcd-16bd5233d5c9/83545845137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0227d673-a537-44a0-b610-78e1c328dd99/56356678036.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_545ab3d9347a4898bfd4914764c7c555.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_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 5396 bytes
SHA-256: 3b3c67638116db7568af5b1efa43834a26a940670f8d7928d67d9e0f04c8d5ea
font_01_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 11276 bytes
SHA-256: c7e5728d721e838e79e49359a3f45f57730d7aeb2058e0ef96a37790e678ac02