Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7628b8565535130…

MALICIOUS

PDF

63.6 KB Created: 2020-12-22 17:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6ce1bfb0fd353132c2df9dfd4d8bf5af SHA-1: 0b50ed9ca492560a7dad9bb720b665d9cc65152c SHA-256: f7628b856553513028a3face1007f79f8b8d4df0a83bfbaa511ad5bfb7020914
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body appears to be obfuscated or corrupted, but the presence of embedded URLs and the heuristic firings suggest the primary goal is to redirect users to malicious sites, potentially for phishing or malware distribution.

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://traffking.ru/strik?utm_term=4+pics+1+song+answers+level+23 In PDF document text
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/8373282.pdfIn PDF document text
    • https://xosofanukofupa.weebly.com/uploads/1/3/4/8/134879033/61659f04e.pdfIn PDF document text
    • https://razezoxuwen.weebly.com/uploads/1/3/1/4/131453099/37590d551.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/9390274.pdfIn PDF document text
    • https://lewanodeb.weebly.com/uploads/1/3/4/8/134885095/keneterakuk.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/5353959.pdfIn PDF document text
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/4649613.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/26fe86a5-b915-458b-a310-32f0a0e9d027/organic_chemistry_2_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7114b64a-46dc-4473-ad11-20ae76cc9505/86584909899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1baa1e3a-b134-4657-908a-e4692ff4376b/street_fighter_v_menat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ab5b85-5347-4797-8c51-3f35903f6e0f/63679845080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee615c8-c221-49d0-816e-c36aaf8d920f/where_can_i_buy_used_exercise_equipment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6e9e76-78dd-4ad5-a030-c3df0745f033/waximunufudokalulakoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5879576d-6915-41ca-b977-f27b39a79e92/72893516259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef7f7ed-057e-4b7b-bc7a-d092a5c5b3d2/fowek.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_off0000bbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD9 5596 bytes
SHA-256: 75e73d0ddba0eed925e449da73391bbba63f39572c3bf41428c5e59337c4c589
font_01_sfnt_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 10156 bytes
SHA-256: fa483d34231fca5f0df08bcebe62cb5d975aded96ab8223f9a168001acf53f31

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