Malicious PDF — malware analysis report

Static analysis result for SHA-256 397ac45bb63b8dd7…

MALICIOUS

PDF

76.6 KB Created: 2021-04-07 15:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d0506e9f1920f8dc5018f324de9b326b SHA-1: 9a6b0cd27458496d800c87d55d429daf2f9719b7 SHA-256: 397ac45bb63b8dd7ed67b7a59ebecad900129d1f4fc3b7ed8bde0b808e0ad95d
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 0.9997

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://maypoin.ru/strik?utm_term=how+to+do+a+reverse+advent+calendar PDF link annotation
    • https://lozusometuzasop.weebly.com/uploads/1/3/4/7/134741376/3911879.pdfIn PDF document text
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/bepuneri.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/iaji6gc/1755700806.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/cXpNiiA/hand_tossed_vs_thin_crust_pizza_hut.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/jc9thbD/semebumosusopigabi.pdfIn PDF document text
    • https://wepotupibir.weebly.com/uploads/1/3/4/8/134881259/neripunetobemu_wivegenunewox_kudulipubu_kitulifej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5fcd09bfc23b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_6022c049449e5.pdfIn PDF document text
    • https://cdn.sqhk.co/widagawinud/bijibHC/lijuraxuvaduketugad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464871/normal_5fcea674136f8.pdfIn PDF document text
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/a8ad9a457e98c.pdfIn PDF document text
    • https://tazanuna.weebly.com/uploads/1/3/5/9/135977230/ef68c7e0028f.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/iwbvpg3/22116610733.pdfIn PDF document text
    • https://bupuvebawa.weebly.com/uploads/1/3/2/7/132740405/85d91e25.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/jakujakula/powagaze.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/formatear_sd_como_almacenamiento_interno_o_portatil.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/hx_stomp_presets_bass.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/53687816423.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/tremble_all_you_want_eng_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/83921965702.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_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 5048 bytes
SHA-256: 33f7bfb604604afc3bd5e0f934e9a72d0a3db3c789b773195e96f17f871fe0f8
font_01_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 11636 bytes
SHA-256: ebca534834b65a3830154313aa0178a27ce6e78dfe16483ed28d584e7554a6fe

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