Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb65bc08044008e5…

MALICIOUS

PDF

77.8 KB Created: 2021-05-12 03:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8a70660d47eb0469c031eb4d496bcb5c SHA-1: 6ea9a2ff21f7fcba12da125423a6a7452c2fdf92 SHA-256: cb65bc08044008e5611b153294f03c2b9710205dcd0822d1e433fa0cd67fa869
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it likely contains malicious content. It contains a large number of external links, including one pointing to known malicious redirector infrastructure at 'dafemum.ru'. The document's structure and link farm nature suggest it's designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=schlage+camelot+electronic+deadbolt In PDF document text
    • https://wizakamulo.weebly.com/uploads/1/3/4/0/134017688/dujewizezirun-kagepu-womufuleva-bokekimumipi.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/49084552209.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/37377212726.pdfIn PDF document text
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/2189766.pdfIn PDF document text
    • https://ribosotegolexo.weebly.com/uploads/1/3/4/0/134013239/faraf.pdfIn PDF document text
    • https://jokikisiva.weebly.com/uploads/1/3/0/8/130873994/1d8d2f1.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/409a7ce6-d9a5-4018-a59a-47816d4ecced/systemverilog_assertions_and_functional_coverage_guide_to_language_methodology_and_applications.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_7eb95fafb4a4406cb212e353a3253443.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/395befe3-a608-4104-b0d4-d37c4f44a0dc/what_is_the_best_workout_to_gain_strengthen_legs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02217528-19a2-4eef-b0a7-fef7e202bad5/what_does_a_legal_research_memo_look_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e88bbf-cbd3-457f-8900-1dbcd68666c0/kenuraduzepifidoxinavelab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47914b9-9b5a-449f-b426-d4931e8d4be2/mitinejixepoduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a6f34f2-24ec-45c0-9a56-8adf02707aa6/how_to_change_your_name_on_nc_drivers_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a863b4d6-1bf7-4ffd-aff1-22d2b0429893/how_is_violence_presented_in_romeo_and_juliet_act_1_scene_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e960a3d-c8e0-4b7a-953f-107a34dc4f4a/how_to_fall_into_deep_sleep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ba1873-97ad-4352-8b22-4056f30ad657/the_time_travelers_wife_book_review.pdfIn PDF document text
    • http://ligiwekuxote.myartsonline.com/38733184513.pdfIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_466ecae3ecf94abc8b343327661cd779.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a801326c-d9ec-4970-9476-18dd650bcefb/23047690721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/022aa6e3-aae8-4d7f-873a-e5fee826f402/35850017704.pdfIn PDF document text
    • http://mifotabelimudon.myartsonline.com/lekibalufebaderaruze.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_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 5416 bytes
SHA-256: 835b4b4a8149e08de7d692834a8d20a6608ad255afd0036bf6b5ac82a179c8b1
font_01_sfnt_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 11520 bytes
SHA-256: a526d183524f73eea0da89918df5e17079eb409a8561966ae5ad6635da306f91