Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ca0bae472cc972…

MALICIOUS

PDF

73.5 KB Created: 2020-12-26 23:06:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 322204bc18cb963f185a95bce6933080 SHA-1: 79ebe158e35788556d85709330c81285f86a3888 SHA-256: a9ca0bae472cc9722a259feb2679429e555a3a37dfba5af089629e59bac471f0
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

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://traffmen.ru/aws?utm_term=navy+blue+jackets+manual+pdf In PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/tixeles_tegovuvetotawug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_5fd79f8801aff.pdfIn PDF document text
    • https://lilikisewusufod.weebly.com/uploads/1/3/2/6/132682662/toxewitelezuliw-vorobijelarow-jukukeb-waforisovatape.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5fcebea790827.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/tudobinajebikefopi.pdfIn PDF document text
    • https://luwimaxilonava.weebly.com/uploads/1/3/4/7/134772317/d95f682c.pdfIn PDF document text
    • https://nezijolumuka.weebly.com/uploads/1/3/4/0/134016970/3979446.pdfIn PDF document text
    • https://fatagodudun.weebly.com/uploads/1/3/4/3/134327877/f5283e.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/kosamupim/29648767271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae1de34-a2d8-41c5-a29e-39fa6cefeaa6/encyclopedia_in_text_citation_mla_format.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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 5616 bytes
SHA-256: f8faaf7b054f0685bfc91d400e96720764736a22e94bba5675299a71d4dcedb9
font_01_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 10956 bytes
SHA-256: b6f2198c7728bcbdbaa91a63776acbf91ab9bfb4f112647b4028af138b280d33

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