Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5f6280fd2c034e…

MALICIOUS

PDF

76.4 KB Created: 2021-02-23 05:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0b6f47b6aed4c9f6eb1db5353c5f0222 SHA-1: 4bfc97886908a65c8092649fb2ecee6b44a714b4 SHA-256: 8a5f6280fd2c034e2b4ddc196304d7caa46b5c3d4a0822f4bf187dccd1fe6bd8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links and a heuristic identified it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Simpson power washer support', likely a lure to encourage interaction with the malicious links.

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://jottigo.ru/123?utm_term=simpson+power+washer+support PDF link annotation
    • http://agencymedia-ig.com/jufaxewevid6u5rt.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/o32Vjba/91882997903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480598/normal_601df59fcdc77.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/gevifurefuxuxekon5dfr.pdfIn PDF document text
    • http://idealicaufficiale.website/fusionner_2_pages_mac7jl4o.pdfIn PDF document text
    • https://cdn.sqhk.co/gasukatebu/NgegcOt/flickr_app_login.pdfIn PDF document text
    • http://spoonnumberone.xyz/the_100_season_3_123movies3inag.pdfIn PDF document text
    • http://edaruzal.xyz/the_sims_mobile_mod_apk_android_republicurfn0.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/hhhlhgf/my_best_friend_anne_frank.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/pGbighg/73848515732.pdfIn PDF document text
    • https://cdn.sqhk.co/supopareso/zvnggig/nyc_weather_radar_in_motion.pdfIn PDF document text
    • http://krokoboko6.xyz/37456247m5iu.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/idijjhz/viridiana_alatriste_funeral.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/zikeko/camerimage_program.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/84122774276.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/sheetrock_all_purpose_joint_compound_ingredients.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/biconditional_statement_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/bstc_full_form.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_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 5220 bytes
SHA-256: aad18c96d9fce59ba14ee94365d7dd506d4a93af0f5aee10e10beda904d9266f
font_01_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 11492 bytes
SHA-256: 0348eeb7d22e9af01a59f5640ce0f48a12f6b973c77ef8f9f76c9755aa6b1587

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