Malicious PDF — malware analysis report

Static analysis result for SHA-256 a411417df879ee06…

MALICIOUS

PDF

74.3 KB Created: 2021-06-09 15:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5510a5434e5cb85c4cdc70cb8c4215e0 SHA-1: c9a6ff1f2d69fb848ed3c1bb44be5ff695227254 SHA-256: a411417df879ee06de82fa75c06bef3ffece9517d3e168f0740aa9eb4673d6b7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous external URLs, many hosted on disposable domains, designed to direct users to download files. The primary lure appears to be related to 'free fire apk hack download', suggesting a social engineering tactic to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crysiq.ru/pbw?utm_term=free+fire+apk+hack+download PDF link annotation
    • https://menajogatidufe.weebly.com/uploads/1/3/0/7/130740573/08f8f1f83bb.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4454665/normal_60b052384d703.pdfIn PDF document text
    • https://dizewipukuride.weebly.com/uploads/1/3/4/6/134615497/bizubewamiri_bajut_vumuvugukisasef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474170/normal_602ffaa0ea438.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4415068/normal_60b4e72cd9b33.pdfIn PDF document text
    • https://mazidumusud.weebly.com/uploads/1/3/4/6/134680178/310669.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393044/normal_6008dcd3d309c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_606dfd2645b3c.pdfIn PDF document text
    • https://kewesolatuveg.weebly.com/uploads/1/3/1/4/131452958/9ec217.pdfIn PDF document text
    • https://nelodukes.weebly.com/uploads/1/3/6/0/136085721/xemutobametow-xutok-liren.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_6060fb2c797a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366365/normal_5ff0189651e38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481836/normal_601762e937ab4.pdfIn PDF document text
    • https://pimidunobesuxig.weebly.com/uploads/1/3/0/9/130970022/nojififikigojet_xidexulul.pdfIn PDF document text
    • https://tusagenitig.weebly.com/uploads/1/3/1/4/131452801/wawedevukig.pdfIn PDF document text
    • https://vuvofazomegudej.weebly.com/uploads/1/3/4/3/134329778/xazumikokewojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_604cf07f9be57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407989/normal_6022534e35e7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458163/normal_60488d5b5ede8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_604ce4b9df2bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447093/normal_605098f83abe1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuperuxowix.pbworks.com/w/file/fetch/144533757/67906124028.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144682992/citra_3ds_emulator_apk_pc.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_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 5176 bytes
SHA-256: f2ac3193e35f61e9483d3210548325115399caed9c26cb87740cb7c1dd8ee95d
font_01_sfnt_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 21988 bytes
SHA-256: 60c4607fd4207fd0b2264f078bef0e40daf4a8d69531cee458dc4ecee5b53c74