Malicious PDF — malware analysis report

Static analysis result for SHA-256 141903d1fe183932…

MALICIOUS

PDF

75.8 KB Created: 2021-01-21 01:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a29973242e5a9561003fb7b08a99e569 SHA-1: 0a0f976900123cfa87f3acabf69ef960adcb0475 SHA-256: 141903d1fe18393230d172de2e371140bd9cee975d78c2c1ea2decb04cafa407
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. It contains numerous external URIs, with the primary suspicious URL being https://druttle.ru/aws?utm_term=cessna+caravan+maintenance+training+manual. The PDF structure and embedded content suggest an attempt to redirect users to potentially malicious sites, aligning with spearphishing attachment tactics.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/aws?utm_term=cessna+caravan+maintenance+training+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390661/normal_5fff9dcda94f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_5f890cfd52cbb.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/tifelibodof-xapiwivariru-wajenozilumufa-virowizusokaraw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417216/normal_5f9e33169953b.pdfIn PDF document text
    • https://vadisasezex.weebly.com/uploads/1/3/1/1/131163908/9741392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409621/normal_5f9417bc0fff8.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/3082734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_5fd974b873139.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/fusidejebi/data_analysis_report_outline.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/pocket_camp_villager_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/26469725063.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/2423330504.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/appointment_letter_format_for_doctors.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/fundamentals_of_python_programming.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000fa93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFA93 21588 bytes
SHA-256: c2f16b3736aaaf12b715740d7d7a6026780a2df6398c940d533c7163c5fd28f7
font_00_sfnt_off0000c691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC691 5084 bytes
SHA-256: 792f8eca527b4c51e7d051d6b8db40dfbbdc97b0654348e4d27219a84a4866c7
font_01_sfnt_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 10140 bytes
SHA-256: 03d19aff0ff4bbceb6cb4cf16ac08458c8efbce9362dd4bc35813042c924a5a8

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