Malicious PDF — malware analysis report

Static analysis result for SHA-256 8128b9e5b3c5ff71…

MALICIOUS

PDF

70.1 KB Created: 2021-01-26 04:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 80bdf932428778e5940b0ea394e19207 SHA-1: c0a9b05fe7e0606b8a10b63d7f4e083deb5e9094 SHA-256: 8128b9e5b3c5ff71c4d8a4519c59e34a1c964e022df358a8917360cbe3c2a057
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This 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 and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/123?utm_term=zachery+ty+bryan+last+man+standing PDF link annotation
    • https://cdn.sqhk.co/xajimujigaju/ihdkVht/79752973353.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487903/normal_6004446fec4ae.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/28622751.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/safujojamarefo.pdfIn PDF document text
    • http://beremoter.online/75002542810fclt8.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/8498500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fe7eefff24ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_600a82d94f03a.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/gfibPFb/retro_wallpaper_computer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_600241168dc3c.pdfIn PDF document text
    • http://shop-kid-toys.online/34912314356bf8i6.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/5135240.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/egg7Mia/5724468678.pdfIn PDF document text
    • http://yarrebitteh.online/td_bank_mobile_check_deposit_funds_availabilityx573r.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/ibjddig/the_floor_is_lava_board_game_uk.pdfIn PDF document text
    • http://idealica-columbia.site/mp3_cutter_and_ringtone_maker_mod_apk7s3m7.pdfIn PDF document text
    • http://stixlife.info/oregon_blacktail_archery_season9r1k4.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/varolexexus/hydatidiform_mole_vs_blighted_ovum.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/heathered_cotton_sheet_set.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/86689790179.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_off0000d5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 5552 bytes
SHA-256: 5292e88f386f0805581e8a8012c23e26390a802b919aeb8389960b29630b9e30
font_01_sfnt_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 10268 bytes
SHA-256: cbc3ddfd6685bb2f4fbac98e54257bb9b788cd2bee9cced1b41dcedd8c10b4b6

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