Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7d25588d364f13…

MALICIOUS

PDF

90.5 KB Created: 2021-05-20 10:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3359bc15e7fecc2bb37986ff45ccc571 SHA-1: 7224683192653e118f8b981ccdb663e656b1cc1e SHA-256: 8d7d25588d364f13106430cec3bacdbc48b63e155ee7d1fb58dc806fb09fc860
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/strik?utm_term=kinh+vinh+danh+b%25E1%25BA%25B1ng+ti%25E1%25BA%25BFng+anh PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449000/normal_5fee456ed3e91.pdfIn PDF document text
    • https://jipunone.weebly.com/uploads/1/3/5/3/135349916/045722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_6041c7c01bf45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_606410e4b3fe9.pdfIn PDF document text
    • https://totofogekof.weebly.com/uploads/1/3/5/3/135327731/e281a85f50bed35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451940/normal_5ff9bcd659cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_6045c5ede53ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_603698f1758e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_60126b4174905.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486356/normal_5ff2a8dc8458f.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/muxozuvalubi/black_s_law_dictionary_tenth_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/ditir.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/81769497716.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/sovajefulivuwafonowo.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/us_army_ocp_uniform_patches.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/tawaxiputeledulizovozuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/where_to_watch_50_shades_of_grey_hulu.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/32150910038.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/15032946889.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/is_one_punch_man_season_3_out.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/kotivowidebifowo.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/sowesabusutejilabakiw.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/68515821370.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_off00011151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11151 5408 bytes
SHA-256: 55e1d5776ef8a66b3344fcc0ab9935da1a9ade409f1ca7747b4bbc2ccb32998d
font_01_sfnt_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 26332 bytes
SHA-256: a84ba35d3b5575e38d9499ce71edce909e9e92c72e8f8c8518b2bd732507e175

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