Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a194a8d053a7154…

MALICIOUS

PDF

76.8 KB Created: 2021-01-06 13:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 98fa7cb3bcf26609d38d4f9ee2cc32ec SHA-1: ef6e2f2da69a4ed92b08b58fd27bd3f492f05a8e SHA-256: 6a194a8d053a715436601a170b066b155ca99da9d79fa72c5c35e9db19deb105
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=monica+the+boy+is+mine In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426823/normal_5f9a47ed35f80.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/EKAghQI/52520555073.pdfIn PDF document text
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/3846494.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/571d879b-c387-4697-94d6-5130a4b7e63a/elder_tempest_5e_monster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01bb2bbe-604e-4cc0-b282-be73b97dd8d8/campo_formativo_pensamiento_matemati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b856d24a-c68f-4f38-be5a-06c2543292e6/10248558386.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/danekuloxojepojoduf.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/haier_14000_btu_portable_air_conditioner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f6faef-2c8b-484a-9b22-f2b4e77217a9/73254133584.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/66361069642.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/missguided_leather_look_shirt_dress.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/carnitina_funciones.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_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 5156 bytes
SHA-256: 230a83f62a8ac718092baeaed5f7eee3daf1a5f0ad11b1532e4e20ed7b23a554
font_01_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 11044 bytes
SHA-256: 3b8e106639e2ace242f706d9885f0569d97358da0f3b26b2a000459a16b86504

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