Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c84d677d8edac5a…

MALICIOUS

PDF

75.5 KB Created: 2021-03-22 00:10:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 67196d60ebb5058e905500112d593783 SHA-1: 2316950b2d7b46f12c4a33bc11375f1bf36492a1 SHA-256: 8c84d677d8edac5aef59fd7b22be5214a228bf391eff423db1dde69b42373e4f
244 Risk Score

Malware Insights

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

This PDF file contains numerous links, including one pointing to a known malicious redirector at 'dafemum.ru'. The document body, though heavily obfuscated, appears to be a lure related to 'Adblock for chrome android mobile', suggesting a phishing or malware distribution attempt. The presence of a link farm and disposable hosting further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=adblock+for+chrome+android+mobile In PDF document text
    • https://wakavofidokevi.weebly.com/uploads/1/3/2/6/132681750/fozeneponosoli.pdfIn PDF document text
    • http://vidclips.design/counter_strike_1.6_indir_botlu_trke7hwe8.pdfIn PDF document text
    • http://onlyforyou.space/how_to_cook_with_da_bomb_hot_saucem3co4.pdfIn PDF document text
    • http://changely.club/hp_deskjet_2542_wont_connect_to_wifixfwle.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/how_to_reset_sentry_safe_factory_code.pdfIn PDF document text
    • https://xoriforibeb.weebly.com/uploads/1/3/1/0/131071072/buwizawor.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/jogudebimekuguzupivilud.pdfIn PDF document text
    • http://dsv-trening.ru/shimano_ultegra_di2_brake_shift_leverssgdfv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_b7b564bee9f34143b1b36b526bc2844a.pdf?index=trueIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_1d4d5d9ae549475a9a50dc2e2a050f25.pdf?index=trueIn PDF document text
    • http://sipanokule.onlinewebshop.net/sigerikaxusexupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ca92bb-5533-4dc7-a022-11257271f59c/77979104023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3700278-bfb7-40c5-8f38-5b132fc7b0bd/who_pays_for_obamacare_subsidies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e41d4ab-e5d7-4734-aaf9-087816388aa0/21_irrefutable_laws_of_leadership_chapter_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a90ffbaa-58ca-4eb9-ba69-d99bcc1bf403/the_keto_carbs_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7561860-39cb-486f-b401-f31ccafc4dc2/2017_subaru_forester_2.0xt_premium_review.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_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 5276 bytes
SHA-256: 266f6a1eaf3c0fbe6279307b81aa9dc954a63e978348a3c3b4fb1f4cd9602072
font_01_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 10532 bytes
SHA-256: 8819943cf03a822c7a654628628bcd59c5c9ff96c7543d1bd01fb90e50e207de

Open this report in the interactive analyzer, or submit your own file for analysis.