Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfef60e9890308c…

MALICIOUS

PDF

66.9 KB Created: 2021-03-22 08:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddc0d46241f765385047210b96b07b15 SHA-1: ecf1c7ba24df3a9f1053795fec6728ccdf62b046 SHA-256: 8bfef60e9890308c88f514f9a7b22c472f234851d2327c794c33a9bf50ac9271
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=criminal+law+lawyers+near+me
    • http://netewe8.xyz/sandwich_king_astoriayn8u6.pdf
    • http://bioforce-co.site/mouloudji_la_complainte_de_la_butte3b4m7.pdf
    • http://mosuxuvemuzuwex.mywebcommunity.org/59848717886.pdf
    • http://akvatehnika74.ru/iced_vanilla_latte_with_skim_milk_calories_dunkin_donutsjxjte.pdf
    • https://cdn.sqhk.co/bulunazi/jgjcjhw/zixetevevam.pdf
    • https://rigefenasoje.weebly.com/uploads/1/3/0/7/130776330/musiwaliziluxi.pdf
    • http://everydayy.fun/32861054445p9aca.pdf
    • http://kismyketio.com/daily_driver_sfc8lji.pdf
    • http://lnstagramcopyrightservices.org/794392874928auj9.pdf
    • https://xesupolapiban.weebly.com/uploads/1/3/4/5/134586318/c0a3fe4abb3cd5f.pdf
    • http://jinevul.mygamesonline.org/47569215481.pdf
    • http://love-your-lips.online/teroxitiuisrt.pdf
    • https://cdn.sqhk.co/levowexesu/hgMhjhj/36473738636.pdf
    • http://pepariravifaza.getenjoyment.net/lukizalusegi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d87de303-66dc-4b23-8396-f4a529e09153/piwupoxoguvunubo.pdf
    • https://uploads.strikinglycdn.com/files/d270e37f-42fd-43a2-a16a-938c49f0d4d8/zeremejexevobumalana.pdf
    • https://uploads.strikinglycdn.com/files/cdc6ddb0-22a0-45f7-a559-ef7f8b8e8821/cub_cadet_lt1045_mower_deck_removal.pdf
    • https://uploads.strikinglycdn.com/files/56742b3a-d6f2-4c25-82c9-d43a21985d6f/is_h2so3_a_strong_acid.pdf
    • https://uploads.strikinglycdn.com/files/10a3a663-0a3e-4788-a465-671e378cec9b/murray_24_inch_riding_mower_battery_charger.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccfd.bin
7cf5a73305781947d7df8a63696a96aa51c1887f312b2b63e35208b252cf0503		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 4932 bytes
font_01_sfnt_off0000ddb5.bin
203f74c8aeb49604efe841afde8692b1ac4b5b7b1505fbee068c65714fc92102		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 9684 bytes

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