Malicious PDF — malware analysis report

Static analysis result for SHA-256 10251f0acc90ec97…

MALICIOUS

PDF

76.3 KB Created: 2021-05-20 11:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4ef6d5b1e0a94f71d02f92cb4f41f65b SHA-1: ca5788ba5a687f512c4079c18e3c27535cc44ee5 SHA-256: 10251f0acc90ec97b74b6d94b98b7b55c939e90b18d59987926b066c4af0bc71
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying them as pointing to malicious redirector infrastructure and a link farm. The primary malicious URL identified is 'https://yafferge.ru/strik?utm_term=mkwii+xml+downloads', which is likely used to redirect users to a phishing or malware download site. The presence of a large number of PDF links suggests an attempt to manipulate search engine results or distribute content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=mkwii+xml+downloads In PDF document text
    • https://jivupofa.weebly.com/uploads/1/3/1/4/131406879/1db3b6ccb245c9b.pdfIn PDF document text
    • https://filududo.weebly.com/uploads/1/3/5/3/135390237/84d8ac9ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474465/normal_5fe48c9c2ce91.pdfIn PDF document text
    • https://mufikufit.weebly.com/uploads/1/3/4/7/134766202/1958144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503791/normal_602d6bad5b87f.pdfIn PDF document text
    • https://rijijuxika.weebly.com/uploads/1/3/5/3/135346754/28ada41e7534b97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379217/normal_60053c2b95816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428078/normal_603b2d51a40f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widuxade/42142571823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/933b2755-db5b-4795-84ca-467dcbfebe48/mcgraw_hill_answer_key_geometry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d13eab-aeda-4222-b30b-8e9db485a772/1817018864.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/vefabudon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7cc1b1-2faf-47b8-a8c9-e7c07fa2c776/boy_in_the_striped_pajamas_summary_chapter_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/anesthesiology_img_friendly_residency_programs_list.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/40481328693.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/nozexaguroviliraj.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/59074888351.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/audio_software_for_windows_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/98020121112.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_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 5104 bytes
SHA-256: 67cd8c66b8a6bedb64be1e61f81cab354809b3408cf001956730a7af73ddb402
font_01_sfnt_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 11136 bytes
SHA-256: be60ab9375d3b8f871008f95fb8fd8c55fe71b24f7b0f06ab60359aa98901cf5

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