Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d17e44715132580…

MALICIOUS

PDF

97.2 KB Created: 2021-03-24 22:20:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 331cb30dfff1d8246558cc074f1f6e65 SHA-1: dfeb32b68a27317dabaaf6b7fd451f576bb06c1f SHA-256: 5d17e4471513258058a47f090dacbe972fab30ff92d039c3b1dba8a47ddb6008
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve SEO for certain keywords. The primary URL, 'https://xezojetit.ru/award?keyword=cna+certified+nursing+assistant+exam+cram+pdf', suggests a phishing or scam attempt by disguising malicious content as a study guide. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=cna+certified+nursing+assistant+exam+cram+pdf
    • http://wikotimu.scienceontheweb.net/market_guide_for_enterprise_business_process_analysis.pdf
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/276fa.pdf
    • https://soberonapi.weebly.com/uploads/1/3/2/6/132681790/daxigedapitibopi.pdf
    • http://ferafukapawap.scienceontheweb.net/conversione_analogico_digitale.pdf
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/rugep.pdf
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/ferazu.pdf
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/42cccb8d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d4ddc6a9-7af5-4228-a6ea-cea32d0edefe/gexes.pdf
    • https://s3.amazonaws.com/nakuzafol/tazapogibarugidebibuf.pdf
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_feb278da6a764a7c83a28b56224599df.pdf?index=true
    • https://s3.amazonaws.com/webipejonavuv/kedafosukufub.pdf
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_068d95b9a229404dbe898ebf89e695dd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/04b76150-419a-4386-9e8c-b9ba4fb59dc4/garmin_vivofit_jr._2_aktivitetsur_star_wars_dark_side.pdf
    • https://s3.amazonaws.com/libusamagowuvo/how_to_make_email_template_outlook_2013.pdf
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_c805e6e81a3641f1b4ed0324cc72dba8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fcc4a125-9527-4ca0-a35f-7dd1b3725086/sabes_que_te_amo_in_english.pdf
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_2a32d61a03aa4726bc14edd25005e8e4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013df6.bin
7c174ac947b76afc3453778e9fdc1f33b28c11883923b228d9a6f304e4616e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF6 5416 bytes
font_01_sfnt_off0001504f.bin
cfa2760845e9f9104a45c86347c41f75a272f7c3179986502ea1cdf9443bb93a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1504F 11420 bytes

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