Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e58471d6eb94d60…

MALICIOUS

PDF

76.8 KB Created: 2020-11-23 08:45:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: eb27340a714e597c56052c6e99f7fba2 SHA-1: 1189a69972f5fe905473f2202f0f25ece5353fb3 SHA-256: 6e58471d6eb94d60bb2d17a261a5aa4e970a09d28c3d0b3a9044e34b63bf1186
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. One of the URLs, 'https://gettraff.ru/123?utm_term=king+of+fighters+xiv+android+apk', is identified as a malicious redirector. The ClamAV detection and ML classifier further support the malicious nature of this file, indicating it is likely a phishing or trojan distribution mechanism.

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://gettraff.ru/123?utm_term=king+of+fighters+xiv+android+apk In PDF document text
    • https://zudamuberul.weebly.com/uploads/1/3/4/8/134854759/3645239.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/3493666.pdfIn PDF document text
    • https://xagajanum.weebly.com/uploads/1/3/4/5/134599721/9768012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_5fb990ffba36c.pdfIn PDF document text
    • https://wuripofowiwafu.weebly.com/uploads/1/3/4/3/134332549/7251106.pdfIn PDF document text
    • https://navadajedu.weebly.com/uploads/1/3/4/6/134614390/kebuwu-rotiri.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/rawewitomamorod_judajori_mebebakoz.pdfIn PDF document text
    • https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/2132107.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/9fedd1ce-e05a-49fd-8517-23d0ab10fa4e/98129530191.pdfIn PDF document text
    • https://s3.amazonaws.com/tosasugokod/42529428625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81acc9c8-e71d-45c5-8e89-3d6aa7535884/zarimisa.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/byju_s_apk_mirror.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/october_2017_school_holidays_scotland.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_off0000c1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B3 12960 bytes
SHA-256: 32a4a5b86a05707d633622a29ca494600cc98a4fb5e0c0a6f04cd9c4530caf04
font_01_sfnt_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 5432 bytes
SHA-256: 930fd7af293eb734253f0a3f3b96ef3e83d6a8c4cc396080b903f5d9de6db5bd
font_02_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 12264 bytes
SHA-256: dc29a1f0260112fe4cf816b332ff6859bc868132879e55f91a1db3b9fb874979

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