Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa77366cf4dd5c9e…

MALICIOUS

PDF

69.8 KB Created: 2021-06-12 23:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ab23cdc5baadb8e9ad24df23a8ca9df8 SHA-1: 332f31405bc7ba693062655a91257050a9aab3c3 SHA-256: fa77366cf4dd5c9e2826a77b23244a9e8eb6384eba76b05f49b939ad571952bc
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

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://krisoc.ru/pbw?utm_term=area+of+irregular+shapes+worksheet+pdf+grade+7 PDF link annotation
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/9595238.pdfIn PDF document text
    • https://danabemove.weebly.com/uploads/1/3/0/7/130776083/lebefu_tipoz.pdfIn PDF document text
    • https://dubigeta.weebly.com/uploads/1/3/5/3/135341625/9edf4714e1655.pdfIn PDF document text
    • https://nizidisifa.weebly.com/uploads/1/3/4/5/134505067/6c93419c4b83.pdfIn PDF document text
    • https://dofudovi.weebly.com/uploads/1/3/6/0/136092117/wuseriwodapuren.pdfIn PDF document text
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/1357202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374196/normal_5fe8f02be108d.pdfIn PDF document text
    • https://xonidaxu.weebly.com/uploads/1/3/4/3/134319292/xobisitakipew-pikel-luwebumiwosaxof.pdfIn PDF document text
    • https://tusunupo.weebly.com/uploads/1/3/4/5/134507020/fiweref.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_604115348541d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485004/normal_5fd7737d7fb49.pdfIn PDF document text
    • https://xikoxuzit.weebly.com/uploads/1/3/4/6/134632277/902fc6.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/ab96a135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_60203430256ea.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/rabidavale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387566/normal_5feb5965a7545.pdfIn PDF document text
    • https://jejoludopuga.weebly.com/uploads/1/3/7/5/137501149/f781f53020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rasovuxosew.pbworks.com/f/dolby_atmos_apk_for_android_without_root_free_download.pdfIn PDF document text
    • http://molujox.pbworks.com/f/dragon_ball_af_tenkaichi_tag_team.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144654471/how_to_adjust_a_watch_without_pins.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_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 5528 bytes
SHA-256: dce878987ae649312c8577b7100e344f765035c3f380fc80c5234497ff956981
font_01_sfnt_off0000e75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 10116 bytes
SHA-256: 99aa0fb3f864b8c667aa2cdfaab96cdbc002d98b08aee59887c0069e101a8613

Open this report in the interactive analyzer, or submit your own file for analysis.