Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04185cebd27e293…

MALICIOUS

PDF

75.0 KB Created: 2021-01-15 00:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d89e34672ee32c1568530cafcdf44bf8 SHA-1: 73c5745249c3b68b17b051d94448aff2d526b60f SHA-256: a04185cebd27e293f21a821008289cabfae55b8aa059c406c1fc5291b6573802
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a significant number of external links, suggesting a link farm or redirection scheme designed to lead users to potentially harmful websites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's primary purpose is to drive traffic to these external sites, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=counter+strike+online+singapore PDF link annotation
    • https://cdn.sqhk.co/relulapezele/cijge9y/star_wars_galaxy_of_heroes_para_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5fffd6a1a008a.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/RVWAtjh/air_traffic_controller_wage_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5f9393eddb89d.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/0FZsOhd/puzonakubuwonotopo.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/suregebugifebubeto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370304/normal_5ff692cb28240.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/gfhbhiL/penguin_pet_names_in_free_fire.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/nobetimogisim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_5fd6e1de962a3.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/nowokil/internal_promotion_announcement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/biochar_environmental_management.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/android_tv_sony_bravia_forum.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/android_studio_3._6_release_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/40611164103.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_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 4956 bytes
SHA-256: ccb8bb6712b0f5299b479e5f718a67cfaead37fe11b1cec002b0117ff950c47c
font_01_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 11656 bytes
SHA-256: a9f6fee4da0ceead34ae4ec8792751b2abdba48657fd6bd3f4fe91596778461a

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