Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b29f2be16ac609…

MALICIOUS

PDF

64.1 KB Created: 2020-11-29 20:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cfd1f299af27bbb02814fb5d369bfcb9 SHA-1: bbb66263e3db2157356f9fc833a4823884a4d7af SHA-256: 59b29f2be16ac609fb8c35afec71f5a7adf08b2f72e2290e671855dd2505c864
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to external PDF documents, many hosted on disposable domains, suggesting a tactic to manipulate search engine rankings or distribute further malicious content. The presence of a redirector link further supports malicious intent.

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://gettraff.ru/strik?utm_term=introduction+to+programmable+logic+controllers+answer+key+pdf In PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/0c1966a4147.pdfIn PDF document text
    • https://bevugatumuga.weebly.com/uploads/1/3/4/3/134316863/kitak-rexaf-pevulajan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5f952bc9825c0.pdfIn PDF document text
    • https://xitonodulamet.weebly.com/uploads/1/3/4/3/134307836/belapiroxudu_nujuvelujujuzej_pidajalowad_wekudaxevi.pdfIn PDF document text
    • https://gefusuteluvis.weebly.com/uploads/1/3/4/5/134595196/bead72ceddb4.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/9357297.pdfIn PDF document text
    • https://tesutubesonazi.weebly.com/uploads/1/3/4/6/134682982/8591862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5fbea2d31169d.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/dd5bda6d-a3b6-483c-9662-3500f47fd883/felabetijawuxaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb242ae-9d01-432c-8b18-1b41c67efc33/gurewipekezajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce974193-a733-4653-b54c-131f77ffeb14/58393768329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c2dfdd-ac27-44fc-8918-b7e84179f612/indirimbo_z_imana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d045bb57-4877-408b-bbfb-41b9e52d6518/gixalewawabuw.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_off0000b7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E4 5812 bytes
SHA-256: 99bc63916554578b4cce2322085318c75ba7f5dc8d8026f0fc4e00015c2f08f8
font_01_sfnt_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 11236 bytes
SHA-256: 22c27c4a9d3ce65ed7abb835d61d5fa45a827e510f70c773deb137b95c69d324

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