Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7bacaa1a24567f…

MALICIOUS

PDF

76.1 KB Created: 2021-05-13 16:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aab51ca6925f6d688fdf93317cdade4d SHA-1: 58fe8a62db0b684ac85029767cf1f3ce1d8b0ae1 SHA-256: 8d7bacaa1a24567fe57963145847be53aa177e973570bdad5c3b62c901301f04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://maypoin.ru/strik?utm_term=should+you+toast+brioche+burger+buns PDF link annotation
    • https://cdn.sqhk.co/livoluxuwad/gjWibYc/folufetij.pdfIn PDF document text
    • http://vefefex.iblogger.org/inspirational_quotes_for_teachers.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/41278426124.pdfIn PDF document text
    • http://zibodotuf.mygamesonline.org/comparative_and_superlative_adjectives_exercises_elementary.pdfIn PDF document text
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/xazoxosimugame.pdfIn PDF document text
    • http://znakomstva18x.site/fatogoz2ie7k.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/jeighah/laravel_6_upgrade_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/DhiTijv/raju_rastogi_interview_meme_template.pdfIn PDF document text
    • http://yazansoft.com/58027501798gc6pv.pdfIn PDF document text
    • http://dedigevobunobe.medianewsonline.com/interview_tips_books.pdfIn PDF document text
    • https://gilamasizate.weebly.com/uploads/1/3/0/7/130775108/7606831.pdfIn PDF document text
    • http://reweder.site/jj_smith_green_smoothie_10_day_cleansebx2ex.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/hf6jdjb/lepirileva.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
    • http://vawerudarasikow.myartsonline.com/anatomy_for_sculptors_head_and_neck.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/45168942855.pdfIn PDF document text
    • http://fatebem.epizy.com/67530624269.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/wimafoxoresasilopa.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_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 5428 bytes
SHA-256: b04651a792fa653f6006bc01f4484e0eaa300ab44272e1c57770ef2717af9e78
font_01_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 11040 bytes
SHA-256: a57f618fc9676b2678dfa408bafa5c1a9003324fba9bebdee8d3e489bd49475e
font_02_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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