Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c7367fa7065819…

MALICIOUS

PDF

73.0 KB Created: 2021-03-03 08:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ba77f73d2356d6d240f90dfe5c8ff51d SHA-1: 522143674b02e3f16025d1b262decd78cbed2708 SHA-256: e6c7367fa706581944549aa55268ea40a0fdb1eb122ae57600564c114f0c73f9
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO abuse tactic. One critical heuristic indicates a mass external PDF link farm, with one URL being https://s3.amazonaws.com/wiwamoxamo/dijiliwemefixusivo.pdf. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://bologen.ru/award?keyword=que+es+la+sinergia+en+el+equipo+de+trabajo PDF link annotation
    • https://cdn.sqhk.co/viwedanej/hhhije3/netflix_party_mobile_download.pdfIn PDF document text
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/ebed1.pdfIn PDF document text
    • https://ginegumogigoxi.weebly.com/uploads/1/3/2/8/132816185/23d43cbb.pdfIn PDF document text
    • http://bedating.online/37371265341k6y6q.pdfIn PDF document text
    • https://nojasiputijaze.weebly.com/uploads/1/3/4/8/134869787/48feb307d08.pdfIn PDF document text
    • https://kotazuzufanimik.weebly.com/uploads/1/3/1/4/131438495/vimopegowujifumu.pdfIn PDF document text
    • http://f1l3download.site/does_fasting_regenerate_brain_cells6mbvf.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/gghcXEV/99766335947.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/ih18Mhi/delajikedetesevajajevuduf.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/VA8geah/suravafajipawenapovozi.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/sekilogudegidokowiva.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/wiwamoxamo/dijiliwemefixusivo.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/street_fighter_5_chun_li_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/bach_violin_partita_2_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/3223802126.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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 5532 bytes
SHA-256: abf4e83bd90117fbbd0367a3c692f5e744d523e98a791e3a279b000524749759
font_01_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 11056 bytes
SHA-256: 008f2372f29401a733946e011666f8ab2908154abfb4e622976d72381c868957

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