Malicious PDF — malware analysis report

Static analysis result for SHA-256 07900f9b9899f6e9…

MALICIOUS

PDF

74.7 KB Created: 2021-05-23 16:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b7da46894f35c8a8124720c2f00a92be SHA-1: 3eca73dc1b4835ca3df35e7fbf473b5e980914af SHA-256: 07900f9b9899f6e991e6390d71ca706108bafa90ff96e3970e6d703ae9020029
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors, suggesting a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://yafferge.ru/strik?utm_term=imagenes+del+abecedario+en+mayusculas+y+minusculas In PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/6596038.pdfIn PDF document text
    • https://pejudipevunasu.weebly.com/uploads/1/3/5/3/135351173/5028862.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/varoxijewegot.pdfIn PDF document text
    • https://tojipojewusaw.weebly.com/uploads/1/3/0/8/130814735/3179710.pdfIn PDF document text
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/rakiramaleru_pinagavuju_gifimat_ziliwafe.pdfIn PDF document text
    • https://zuvopiramalatug.weebly.com/uploads/1/3/5/9/135981479/jetajoxexe-sokebuxususupi.pdfIn PDF document text
    • https://zobanegasub.weebly.com/uploads/1/3/1/1/131164549/bf6aeb6f422.pdfIn PDF document text
    • https://xakalawuvobovu.weebly.com/uploads/1/3/1/0/131071286/44d3dc4b8086.pdfIn PDF document text
    • https://zigudufojivop.weebly.com/uploads/1/3/4/7/134718002/7105829.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502236/normal_60083752c0da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_603e2818d0405.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/18f04221-1445-4fde-86d1-03f3cf43e920/upkar_mechanical_engineering_objective_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf3426c-5678-40bd-aa2d-f54aa4001ae8/14195086119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebcd18af-6377-4e9c-8e9d-f9ebee9b0cda/winijulowokanezapejido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ba50d5-e62c-45a5-a7b4-b0950fa278e3/coleman_5000_watt_generator_wheel_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8537586d-2123-4a6d-92dc-0cb430b0304f/26288362646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66af686b-c62c-46d8-bf64-b6e9b6b9a463/black_and_decker_coffee_maker_manual_keep_warm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afbd3ca8-9182-4820-8bdd-243ac6f1a61d/rujigitusonivimakap.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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 5440 bytes
SHA-256: 7f49322bc3adefebeccad18974fa50b0cc38aa1d7a56c374d8aa09ba9ce0efd3
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 11364 bytes
SHA-256: 482da8b584b29f371801cd2e04df27d2278f067edd1d353d19065a8d018c148b