Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bfbe12079d7c02…

MALICIOUS

PDF

74.8 KB Created: 2020-11-13 06:46:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 19e55a254f88e71927ad767328be7e83 SHA-1: 0cf737411e01f707c19909ff69524af76e8177bf SHA-256: 54bfbe12079d7c025f355cee4a50125717e60e16b0fd133758313c75d59bbc4e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' specifically flagging it as a potential link farm. One of the embedded URIs, 'https://trafftec.ru/123?utm_term=mini+swamp+cooler+diy', is directly associated with the document's content, suggesting a lure to external content. No scripts were extracted, but the structure and heuristics point towards a malicious document designed to redirect users.

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://trafftec.ru/123?utm_term=mini+swamp+cooler+diy PDF link annotation
    • https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/livororu-suxogotoxubifi-burituwow.pdfIn PDF document text
    • https://nezumise.weebly.com/uploads/1/3/4/2/134265586/eec1aad5f.pdfIn PDF document text
    • https://suzaruluzi.weebly.com/uploads/1/3/4/4/134455671/310392.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/galosatopixawipidoxe.pdfIn PDF document text
    • https://pibekexamu.weebly.com/uploads/1/3/4/4/134401786/8570570.pdfIn PDF document text
    • https://tudidufagul.weebly.com/uploads/1/3/4/6/134622529/tasoxaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5f91594794e3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f95982a75f4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mefovu/decora_fashion_shops.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/jukewag.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/new_destination_b2.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/coprocultivo_con_antibiograma.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/6297866617.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/gti_100mg_incredibles_mon_cherry_gummies.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 5124 bytes
SHA-256: aa277225e8098f87e461debbd678a054dcf3a61d35b98e2c378f78a5c81e2eca
font_01_sfnt_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 10940 bytes
SHA-256: b418a672d9c529b6ce880ad36cb7b9b7b1e61c8f7cf144f0949e23764ea378f6
font_02_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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