Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b336e5582260b90…

MALICIOUS

PDF

71.2 KB Created: 2021-02-21 14:09:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2209cce35df46f692ce50a5c51f6c3b2 SHA-1: 9bc112b8bde85710d52100f31dd132d3c5150f0c SHA-256: 9b336e5582260b905054ee23e2f5ee0a51d72bfc0b5e365863f17b26064b3dfb
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

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://leonvi.ru/aws?utm_term=cuantos+metros+hay+en+un+hectometro PDF link annotation
    • https://basopuseg.weebly.com/uploads/1/3/4/7/134703880/00399.pdfIn PDF document text
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/9194569.pdfIn PDF document text
    • https://rapalavosifezo.weebly.com/uploads/1/3/4/8/134886177/tikure.pdfIn PDF document text
    • https://sokefumupuzezu.weebly.com/uploads/1/3/5/9/135991751/wuvufum_rapugubupimu_xugasifum_zomuru.pdfIn PDF document text
    • https://gininigexaviw.weebly.com/uploads/1/3/5/3/135350692/c6c2b03e7fb85.pdfIn PDF document text
    • https://cdn.sqhk.co/xibexowufifu/hjj4heo/helix_jump_friv_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/hIvW9UF/family_chantel_winter_boyfriend.pdfIn PDF document text
    • http://desekikimok.22web.org/android_room_tutorial_kotlin.pdfIn PDF document text
    • https://rixajijinuroje.weebly.com/uploads/1/3/4/4/134473879/kelazidibijosutake.pdfIn PDF document text
    • https://fusofopafufet.weebly.com/uploads/1/3/5/2/135294951/c2cf48b8150d.pdfIn PDF document text
    • https://vebuxevofarina.weebly.com/uploads/1/3/4/0/134013543/3165405.pdfIn PDF document text
    • https://ketuvukelese.weebly.com/uploads/1/3/4/3/134351906/kepejijaseze-filir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nudifezidezi.rf.gd/ascus_with_negative_hpv_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/battletech_guide_book.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/tbd_full_form_in_asia_cup.pdfIn PDF document text
    • http://voxosejak.rf.gd/entrepreneur_business_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/day_and_night_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/latest_weather_report_in_durban.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_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 5016 bytes
SHA-256: 98aa156bea16782d376287019904a8e4845c83f49013b3d0597932f6f3fb76d0
font_01_sfnt_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 11840 bytes
SHA-256: 114c78ca1f95dc95fe03e8aa6b1d354ecd52cebb711b1bb8f1e029f5a620ed1c

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