Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d5ca0c11659f06…

MALICIOUS

PDF

68.9 KB Created: 2020-12-18 05:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 722e184a8b49b8999154ef5279e3f82b SHA-1: 8df95a180b2003e8daf064c1e607d4e8972ac2a1 SHA-256: 34d5ca0c11659f069c2a371ccd0d7af4b3fbe11cfb877554a5a3b04db6fc4065
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'traffmen.ru'. Another critical heuristic indicates a PDF link farm, with one URL pointing to 's3.amazonaws.com/suximawo/31379233225.pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/123?utm_term=la+jolla+high+school+az In PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_5fbeb6ba1c597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f8f4e052c8a8.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/givonatoguliroj.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/suximawo/31379233225.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/application_letter_format_in_english.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7ab2463393450185574c8/t/5fcec6b7798354522dfc0e44/1607386807844/litopugefunawukawiw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2ac18a3bf4b14abb478a5/t/5fca0289e262c01594677ad5/1607074443092/51431291782.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/15504913749.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc38b1e9698b02c7f3141e7/t/5fcafe111415195da07d81db/1607138833659/mivexiwaniruxizepu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57497bd14ff0dd2bb5313/t/5fce10c4c836a917f933fc19/1607340229077/48836242638.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36ee160f2895dc1f7ed49/t/5fc718ada907d7439cd341f8/1606883502772/catan_dice_game_app.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_off0000d01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01E 5032 bytes
SHA-256: d87485e2fbc53f886c4fa0847a5655d1f5d4ccdf15f6db3580708f7b4e1947ba
font_01_sfnt_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 11176 bytes
SHA-256: 8507a30eedea156816b25748749ab0d4ec913594336878ee935f91c7d0ddbc59

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