Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fdee37faba4ced…

MALICIOUS

PDF

70.6 KB Created: 2020-11-18 16:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5621cdfae06ec3fc3ca1c58777c1d6a7 SHA-1: d36bf2159bb978eb71daf3e42053b78855be9124 SHA-256: a1fdee37faba4ced9b4049cb5ff5a684533e015ee80822ef9976d379a6ebfbb2
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on disposable domains or potentially malicious infrastructure. The heuristic firings indicate this is a link farm designed to redirect users, with one URL specifically identified as a malicious redirector. The ClamAV detection and ML classifier further support its malicious nature, likely as a distribution mechanism for other threats.

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://cctraff.ru/wb?keyword=score%20match%20hack%20apk%20ios In PDF document text
    • https://rutaluxunenore.weebly.com/uploads/1/3/0/7/130740368/beponuki.pdfIn PDF document text
    • https://pukaxixuzex.weebly.com/uploads/1/3/4/4/134492253/tuwedufot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_5fa0611db0ea0.pdfIn PDF document text
    • https://sojejizewo.weebly.com/uploads/1/3/4/4/134460985/lunisagerexubotar.pdfIn PDF document text
    • https://juxupadozimufa.weebly.com/uploads/1/3/4/3/134388451/ecd3769f49.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/sakitivezilike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_5fa9cbe64b588.pdfIn PDF document text
    • https://sunuzokelegawo.weebly.com/uploads/1/3/4/4/134476032/a9e93f237cedb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pegek/38405025070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff432c2c-bc06-458e-9bcd-0829f1227ed0/donald_passman_all_about_the_music_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eedcd0e4-24d4-41b7-8daa-ec0a36f3aa72/indksiyon_ocaklarnda_enerji_tasarrufu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 4988 bytes
SHA-256: 79176d81b044f9ec5dc8302e9503cb11f0d3bf00527d586159c7b190eab72963
font_01_sfnt_off0000d9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 11164 bytes
SHA-256: b98fc83d54251e4027059dc37d94763b9d53aa8dab99f4036e0de56c1088f875
font_02_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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