Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa87d1298061b17…

MALICIOUS

PDF

78.7 KB Created: 2021-05-19 05:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 374bde54a88b3243c76ba0a28d54d924 SHA-1: 2dbd4214596dc5dee7169103ceb2b95d958c3dd8 SHA-256: 0aa87d1298061b1713080a6aaea3d9246462d25ec58890814e55171041905179
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/strik?utm_term=2007+porsche+911+turbo+engine+specs PDF link annotation
    • https://dariwatipizodaf.weebly.com/uploads/1/3/5/3/135323996/pideminim_metojav_dixadewej_kadisezub.pdfIn PDF document text
    • https://zozijopese.weebly.com/uploads/1/3/3/9/133997316/vewis.pdfIn PDF document text
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/4410373.pdfIn PDF document text
    • https://xuwojuzo.weebly.com/uploads/1/3/4/4/134471705/fudati-nejofufu-duxasu-roliwaje.pdfIn PDF document text
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/zabafiv-repoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_605a0bbe50d61.pdfIn PDF document text
    • https://tutonaxubetu.weebly.com/uploads/1/3/5/2/135296536/sewedobiwibilaxutov.pdfIn PDF document text
    • https://waliruwixogipi.weebly.com/uploads/1/3/4/0/134016871/wagefomened-dizagesixafarow.pdfIn PDF document text
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/7711900.pdfIn PDF document text
    • https://kizufujuzuvajet.weebly.com/uploads/1/3/5/3/135316206/5575061.pdfIn PDF document text
    • https://noragunefide.weebly.com/uploads/1/3/1/6/131637841/1415367.pdfIn PDF document text
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/pigove_morefuge_jajezunat.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/1881054.pdfIn PDF document text
    • https://xuxijoma.weebly.com/uploads/1/3/3/9/133997678/2711560.pdfIn PDF document text
    • https://javodezupaxut.weebly.com/uploads/1/3/1/3/131380273/4adbcd88c8.pdfIn PDF document text
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/zosuke_pasano_virizateva_ledep.pdfIn PDF document text
    • https://jugivukovetid.weebly.com/uploads/1/3/0/7/130739525/zumixifewimido.pdfIn PDF document text
    • https://fesuxuxij.weebly.com/uploads/1/3/4/6/134693362/betalin-vofavara-vavakigi-rosim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500665/normal_5ff318d23ecf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480750/normal_60480fffacfbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/sadaw.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/rimuruzasebu.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/68822774965.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_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 5560 bytes
SHA-256: 4f3405664b45acf967543c84eeaa3eb5e264b86a039a1a38c59c3f5b3165ff19
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 11432 bytes
SHA-256: 57cd1b7a980682ce8257afab9e66c71c13ab00a99c0307d8f80efd69fc3830de