Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42fccac2b5c414e…

MALICIOUS

PDF

76.2 KB Created: 2021-05-14 01:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9449d746300659eaec363de94e82e72 SHA-1: d1ed09060fee6d93830a9d935ba4d37f3cf6a6c5 SHA-256: a42fccac2b5c414e55e78d4dc76dca040b81b6622b695b0c9692ac450268d316
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to legal services, directing users to a URL that includes 'criminal lawyer houston free consultation'. This suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jottigo.ru/strik?utm_term=criminal+lawyer+houston+free+consultation
    • https://static.s123-cdn-static.com/uploads/4448743/normal_5fcd3eb8c2a6d.pdf
    • http://lezofifividex.scienceontheweb.net/journal_prompt_for_high_school.pdf
    • http://litvinenko.xyz/lofogiwibgc5lm.pdf
    • https://xebagaxasu.weebly.com/uploads/1/3/4/8/134878678/718114.pdf
    • http://xumugawejal.scienceontheweb.net/dumujebuwafuwafajuwogumi.pdf
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/f5e756b43e.pdf
    • http://nemosixumeki.mypressonline.com/bmw_i3_technical_specifications.pdf
    • https://lututigit.weebly.com/uploads/1/3/5/3/135335707/wisakakituril_migojudopir_tokazodavir.pdf
    • http://vulufinagi.mypressonline.com/chinese_language_download.pdf
    • https://cdn-cms.f-static.net/uploads/4365602/normal_605f6f913a588.pdf
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/ab359d141828d8.pdf
    • https://cdn.sqhk.co/xeloxilava/B4SEjjK/globe_data_entry_app.pdf
    • http://jushq.pro/polodijadiredapuxafutaj7jk2i.pdf
    • https://cdn-cms.f-static.net/uploads/4489853/normal_6052d0b825bcf.pdf
    • https://cdn-cms.f-static.net/uploads/4367310/normal_603a217335432.pdf
    • https://muxajugukeso.weebly.com/uploads/1/3/1/4/131453177/tesajaxenu_nuwunukumajog_foxuka_laxuze.pdf
    • https://cdn.sqhk.co/gadewekunel/yTie8he/apple_mobily_8.pdf
    • https://cdn.sqhk.co/mogezunir/gjiXHif/inclusive_environment_rics.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lolugedupagimu.epizy.com/definition_de_la_sanctification.pdf
    • http://gupupofof.rf.gd/tegovalesedis.pdf
    • http://mesitineka.rf.gd/34840175640.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3a.bin
ed27b5e0d625baf1873cd1e024bbf91552d7b262ed4aef4ee8b144ab912dede0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 5220 bytes
font_01_sfnt_off0000fdde.bin
39976ee78f092f4170b516a53dd28f630157bce46fe9d56efd01c146a4c9a686
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 10960 bytes