Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfe9d7c34136351…

MALICIOUS

PDF

128.6 KB Created: 2021-06-11 01:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b781a3a6d78d081d8be4eb65b33a66dc SHA-1: e5fa2d0ba77ad6d33cf30b94a0c2a287ad6ea955 SHA-256: ddfe9d7c34136351947660f0ae0fa20e3075e03aefc999d8ccba78826a4f1957
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://irlanc.ru/pbw?utm_term=all+smash+ultimate+dlc PDF link annotation
    • https://juzatimeb.weebly.com/uploads/1/3/4/6/134605854/jagos.pdfIn PDF document text
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/gefupem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415543/normal_5fdf72380e824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484093/normal_60281651ccdf2.pdfIn PDF document text
    • https://ralokokotozupar.weebly.com/uploads/1/3/4/3/134340958/0de7b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459787/normal_5ff2f2f4314a2.pdfIn PDF document text
    • https://burojexadolej.weebly.com/uploads/1/3/4/1/134108553/tojasemido.pdfIn PDF document text
    • https://ketibavobatuver.weebly.com/uploads/1/3/4/8/134849788/3631191.pdfIn PDF document text
    • https://lekakuvikel.weebly.com/uploads/1/3/1/3/131380005/f0e5701e0.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/fivudemof_vamobipumumer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00dddd2-8deb-4855-9b8c-5c7317e9c04c/sales_business_plan_template_word_free.pdfIn PDF document text
    • http://fijovolumi.pbworks.com/w/file/fetch/144886968/pronoun_antecedent_agreement_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642ea793-0be7-4384-b4ca-93376f9f340a/thunder_cake_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/757c7f13-0219-4b3e-ac14-21289dfe6856/niremupepikipoboguditiz.pdfIn PDF document text
    • http://gupiguna.pbworks.com/f/what_are_some_abiotic_factors_in_the_taiga_biome.pdfIn PDF document text
    • http://fisojun.pbworks.com/f/xusederivikujesoxarira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae5fac1-f8d9-4fca-9e5c-bd10cd1201c4/jololefipuk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18441 10920 bytes
SHA-256: ec2be68fba18fff2577eb9ec7a1993b740bca98da376cc601acd4c57c03ce594
font_01_sfnt_off0001a815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A815 5072 bytes
SHA-256: 696989b7b25acb35afc7df53418914137aa5db8cedbbc9f5b35f9924259b9097
font_02_sfnt_off0001b91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B91F 4892 bytes
SHA-256: 97cbd3405db98ce33fdc0047d13104f0eee2f46bc8fb9cbd0061c745d334a1d0
font_03_sfnt_off0001cacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CACC 12416 bytes
SHA-256: 0afe198e6868a173aa3cd92a694dd172cfbdb0b09fb6ba80897f4a0d1fe71b39