Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7491cfc52f12792…

MALICIOUS

PDF

76.6 KB Created: 2021-04-08 19:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: db03386929fe508891d2d7c7998ae2ff SHA-1: 2723fa4f1d8364b4fcc418b045c42495fe9edd54 SHA-256: c7491cfc52f12792eb572a053be000271889f486c164975049f37984db0274a1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a link farm with numerous external URLs, suggesting a phishing or SEO manipulation attempt. The embedded document body, though truncated, contains a suspicious title that could be used as a lure.

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://resalured.ru/strik?utm_term=do+navy+seals+allow+tattoos PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454556/normal_5fc98ae8bbf1b.pdfIn PDF document text
    • http://fowatufilomit.iblogger.org/york_yvwa_chiller_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475992/normal_603ea3c30eb0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_602cb381e5ae8.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/hbpijha/gelutolixujamofidobobuzoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489028/normal_6023ce83a3d92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_600d706f7dc2d.pdfIn PDF document text
    • http://juwidasomasi.iblogger.org/53804387868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_600e0d929ec1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_60039915963d6.pdfIn PDF document text
    • http://kizidotiz.iblogger.org/common_core_4th_grade_math_book.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/d8DEbhb/17531065865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_5fe8b64382439.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_edf291a220e5481dbd558d37e30c7b21.pdf?index=trueIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_6dc6124a93954d29b84b346c07b9928a.pdf?index=trueIn PDF document text
    • http://fiviwuzovalexop.rf.gd/rumime.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_59d52c6f35e24fbc9c647d93cd7ca0d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/what_qualifications_do_you_need_to_be_a_secret_agent_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/zotigepofudikipaberuxuj.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/winchester_model_12_youth_pump_bb_rifle.pdfIn PDF document text
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_0e4fa52a05db40bf8d5657748f02fc4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubafezin/zibuduxevunalosoxubas.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_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 4836 bytes
SHA-256: 071a1da7b0077c01968fb592f7272e655db44deb9b946ec811f38fbd7503e959
font_01_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 11008 bytes
SHA-256: e5aab9b53cf4063a58735ef73a92803276d85b1aa0cd8003ae8cc99126becae0