Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0d8e4cc4df87dc…

MALICIOUS

PDF

70.3 KB Created: 2021-03-12 03:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4a18965ef3ad053d5f183197a90524bc SHA-1: 08862841f0cb31ea52bcead92b5ce674e9042642 SHA-256: fc0d8e4cc4df87dc01579c97a08ac02724c271e3ceb785f8b4bb59f87b4f3cc0
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO redirectors designed to phish users. The 'DOC BODY' content, though heavily obfuscated, includes terms like 'Casio g shock 5081 ga-100 battery' and references to 'wkhtmltopdf', suggesting a lure to a fake product page or scam. The presence of PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics, along with ML and ClamAV detections, strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/strik?utm_term=casio+g+shock+5081+ga-100+battery PDF link annotation
    • https://tibijipobarak.weebly.com/uploads/1/3/4/4/134493900/734141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5fd2ad4d49ef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_603e5a8683133.pdfIn PDF document text
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/vinafogiguk_garesos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446925/normal_60252813d3035.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/bHYigBA/75789326127.pdfIn PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/modukoko-megogukepazimul-ripoguseganega-burobosuwef.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/jbjaQSf/fuwogoxagij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_6041a5443ebd6.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/SKgjgcz/brawl_stars_colette_voice_actor.pdfIn PDF document text
    • https://cdn.sqhk.co/sowotewope/ijhgihb/63892994993.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/gusule/gesadosubekam.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/employee_attendance_tracker_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/47637228954.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/wicked_good_ketogenic_diet_cookbook.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/seborrhoeic_dermatitis_capitis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/43049052548.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/english_file_intermediate_workbook_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/jifadazajogivubuwodasi.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/renovosenibog.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/12th_marksheet_online_tamilnadu.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/13502743418.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/the_100_startup_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/psychology_learning_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/how_to_fix_a_water_softener_salt_bridge.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_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 5784 bytes
SHA-256: afceaea44faeb9c4e7849584277a385a5910b052a042d7be9d67a442c29c11b5
font_01_sfnt_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 10144 bytes
SHA-256: 68253eda0de8115932703747dd23ec0f73d7e4f0ad13abe47ff7822c3533a11d