Malicious PDF — malware analysis report

Static analysis result for SHA-256 988743abebd52885…

MALICIOUS

PDF

88.2 KB Created: 2021-03-11 11:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: de142b5cde1072d88a1af5c17e044200 SHA-1: 533c4dd99d944ee1d27e9f33896fca46febb8f0b SHA-256: 988743abebd528858cfe0fb718295f7e8b178d7040b75dbf74677bc980b165d4
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 pointing to disposable hosting services, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites to obscure malicious destinations. The document body, though heavily obfuscated, contains fragments related to search terms and application metadata, reinforcing the idea of a lure.

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://druttle.ru/strik?utm_term=does+gluten+free+taste+bad PDF link annotation
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/c42a86834547d3.pdfIn PDF document text
    • https://jovavogi.weebly.com/uploads/1/3/4/5/134597399/lixabi.pdfIn PDF document text
    • https://cdn.sqhk.co/rivojotewez/haa0jji/cordial_cherries_with_clear_liquid.pdfIn PDF document text
    • https://kofuwirobunugob.weebly.com/uploads/1/3/4/3/134318534/6b3496ffff62.pdfIn PDF document text
    • http://wonder-ita.fun/best_smart_bathroom_scales_uk017gl.pdfIn PDF document text
    • https://cdn.sqhk.co/wizevomorofe/Kienkgh/4939109596.pdfIn PDF document text
    • https://nonejazusedebe.weebly.com/uploads/1/3/6/0/136099570/9599741.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/brandy_alexander_gallon_ice_cream.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/rational_choice_theory_book.pdfIn PDF document text
    • http://mivetys.xyz/overkill_lyrics_colin_hayfc5kh.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/90353212897.pdfIn PDF document text
    • http://avtoshtorki.shop/how_to_recover_traumatic_memories0igiq.pdfIn PDF document text
    • http://kanshoper.site/botukifawudezi3yvip.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/gj9Jife/34197584062.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kopisigapub/64648099435.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/integers_powers_and_roots_worksheets_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/xeveposigadofizagib.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/grapevine_traffic_weather_report.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 5048 bytes
SHA-256: 53693829c70bfbc535024e39537287280f0689a3044cc89f0128c6bc3897b910
font_01_sfnt_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 10976 bytes
SHA-256: de3db30eb70ddcdb667d5ba7e0bfff66f12891d668c7fc9ceafec341c7751807
font_02_sfnt_off00014543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14543 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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