Malicious PDF — malware analysis report

Static analysis result for SHA-256 694d88a3c4aa3b34…

MALICIOUS

PDF

90.5 KB Created: 2021-03-28 07:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8c04762f5e7d913d56b9f8b8274112f8 SHA-1: 8fbbacc80bc5dcfcc207b8a01580c180de46eb8f SHA-256: 694d88a3c4aa3b34799deaa47da29e7266776bc78cabd38bd4cf13dbb93f0d35
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded links, many of which point to disposable hosting services and known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document's primary function appears to be acting as a link farm to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=el+esqueleto+humano+y+sus+partes In PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/2ljdW4j/legend_of_vikings_game_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/xobabowiwa/fjejjt8/fowawitanuvuguf.pdfIn PDF document text
    • https://rirokenu.weebly.com/uploads/1/3/5/3/135349909/faf1575c.pdfIn PDF document text
    • https://davixugamewa.weebly.com/uploads/1/3/5/3/135334906/09729.pdfIn PDF document text
    • https://nefositasin.weebly.com/uploads/1/3/4/3/134310380/kemuzuwewuxemovegela.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/Zjdgfhh/fevebojevita.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/1rHxg1t/how_to_cook_bacon_wrapped_jalapenos_from_kroger.pdfIn PDF document text
    • https://bujefodamefizup.weebly.com/uploads/1/3/1/0/131070612/kiwesadowazesobefoz.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/3173ca3e272fa.pdfIn PDF document text
    • https://faxilazow.weebly.com/uploads/1/3/4/7/134725206/7042558.pdfIn PDF document text
    • https://jawejeletisib.weebly.com/uploads/1/3/4/8/134886371/wiwabe.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/jfjejjv/black_friday_2020_deals_best_deals_products.pdfIn PDF document text
    • https://cdn.sqhk.co/tisezalave/Sryyhai/88922608609.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/3473a617-266e-4b1c-b14a-14eb70dbc0c3/70731481103.pdfIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_1e04c747c2924e2982fc04618d31fc5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89815ef1-2570-43fc-aabb-f313322db112/can_you_use_turtle_beach_xo_four_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20008ffb-5128-4a41-a100-94fdae8581f9/paneduribidudidaro.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_26d0197a6fa148c0b3c133fae3623025.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f6339f-1026-413b-b15f-580b56dc804c/53868554990.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_off000121ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BA 5244 bytes
SHA-256: fde9b0b534aa2ad8f913b429d67933d5d8fe2aa135f9a2d9c3eb5fb6f0542734
font_01_sfnt_off0001336c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 12468 bytes
SHA-256: 85043393a965d736d4662765c7e5a56da9ec47506993cbe756a386d043bcc31e