Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd8c4b7311184fc…

MALICIOUS

PDF

76.9 KB Created: 2021-03-11 18:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 02421cd5db102446a6aad133e7fc1e56 SHA-1: 4d10d8d4a05784529091327562d502bbab001373 SHA-256: 2dd8c4b7311184fc05dc345d791c73e11c0e24dc0d973e26239d970183139571
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 embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to 'electrical engineering solutions', which is likely a pretext to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=principles+and+applications+of+electrical+engineering+solutions PDF link annotation
    • http://tizezs.xyz/xupiraxewojubetozananba7xi.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/11th_chemistry_important_questionsi7bqz.pdfIn PDF document text
    • http://vnatural.space/proform_505_cst_treadmill_weight_capacitysd1xj.pdfIn PDF document text
    • http://stylecurtains.com/kerosene_heater_repairmanynkn0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fcef95b83c39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5ffab5d63819d.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/the_creative_curriculum_for_infants_toddlers_and_twos_individual_child_profile5swqc.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/jhhjbha/copart_ohio_careers.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/ripeniwufukamju13.pdfIn PDF document text
    • http://pipvip.ru/logan_paul_no_handlebarsl2szn.pdfIn PDF document text
    • http://top-shop-store.website/572192026953tskr.pdfIn PDF document text
    • https://cdn.sqhk.co/lapitobexeva/njehh4Y/within_movie_2009_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/ghqhehe/17164090663.pdfIn PDF document text
    • http://salonhq.xyz/66476785041mlub2.pdfIn PDF document text
    • http://shoppermarket.online/731972147774999y.pdfIn PDF document text
    • http://labincom-med.ru/radawunusefiwevezizebirutyyknk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5ff669084ac29.pdfIn PDF document text
    • http://realwockyc.info/69017886500w3vvd.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/zupenafud/bubba_kush_auto_grow_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/wafogumizekonatanujivaka.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_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 5324 bytes
SHA-256: f1e368896e8717ef377b326cc3fb0685a81db6f310c5ee2b9895951ef395d368
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 10744 bytes
SHA-256: 0752d1075e93238c0e9fe278a2130d5db84e4a80f056c1ce0e28921de7b346fd

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