Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc1b6033f39a094…

MALICIOUS

PDF

74.2 KB Created: 2021-03-11 05:15:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b3dd8e2b9c0f2a0132c390e799921660 SHA-1: 2104c1493adcfc7d3e15f47794e0a243dbb4d565 SHA-256: bdc1b6033f39a094b211cd65095f8daedec74d01e6579ee719614ba68e073e61
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to be a lure related to a product manual, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=nesco+4+tray+food+dehydrator+manual PDF link annotation
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/kototanuwuxezolep.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwikiw/FheDItE/18844038131.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/nipizapuvawetowo.pdfIn PDF document text
    • https://zejinimab.weebly.com/uploads/1/3/1/8/131856072/3134dbf0c.pdfIn PDF document text
    • http://datinge.site/jodepubalageripogghlyh.pdfIn PDF document text
    • http://fortysgjdk.fun/accounting_for_decision_making_questions_and_answersug307.pdfIn PDF document text
    • http://jumbochecker.com/47909365663kmau7.pdfIn PDF document text
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/kamewazuvazakub.pdfIn PDF document text
    • http://xruhdfo.site/52472791890elitx.pdfIn PDF document text
    • http://devgm.design/20140222179i77vg.pdfIn PDF document text
    • http://habirovradik.ru/5ft_king_kutter_finish_mower_belt_diagramyxm09.pdfIn PDF document text
    • http://katermore.ru/31187187183ciooi.pdfIn PDF document text
    • http://argo-tourism.com/445597778355vgoj.pdfIn PDF document text
    • http://tertov.xyz/81862200330o20gt.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/wofuvasivobav.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/king_kutter_6_tiller_manual.pdfIn PDF document text
    • http://copyright-help-center.com/361849491207i8ho.pdfIn PDF document text
    • http://life50it.pro/casio_standard_w-735h-1avdfkva18.pdfIn PDF document text
    • http://parkingtest.xyz/rotixedotuvv1fy0.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/lfceGgf/cookie_clickers_2_unblocked.pdfIn PDF document text
    • http://teasmall.space/27615421858pdz8i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 5420 bytes
SHA-256: 2c566e328880377c2139589a7d4e805a14d77ea53d8292b2ef033faba823f816
font_01_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 10572 bytes
SHA-256: b702da62ec6c90225dcf942d906f721661fbf0396a492ee413196faa3fc9026d

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