Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84a53e5cca0069c…

MALICIOUS

PDF

77.2 KB Created: 2021-03-17 02:37:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 45f749053af3c7b213cb2e8b3ca798cc SHA-1: 3afc32135e152c2e127ba59900da7b9cbeaeee99 SHA-256: c84a53e5cca0069ca7285d6de25493b6fb1419f681be98c6234840dba1fcbac6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, forming a link farm, with one prominent URL leading to a malicious PDF. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing trojan. The PDF's structure and embedded links suggest it's designed to redirect users to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/award?keyword=braveheart+theme+piano+sheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469836/normal_6001eb394838f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_600efb47cf01a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376599/normal_5ff134d910f89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_6004b2aa893aa.pdfIn PDF document text
    • http://jomikifu.medianewsonline.com/research_journal_of_pharmaceutical_biological_and_chemical_sciences.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/91817869231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416810/normal_6035a8cc64406.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/33127533029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_601fa8c460ac6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_30387216061645879edb04073fa107c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fibesezati/benson_ken_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/lupigoxevolamiriwujeboj.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/nufifujosizebipotipuxem.pdfIn PDF document text
    • http://xipijokezi.rf.gd/vomifagadofasanawalidab.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_0af9adbe078e4ef99064be0da67206bd.pdf?index=trueIn PDF document text
    • http://nedopukini.rf.gd/bnf_for_child_2020_free_download.pdfIn PDF document text
    • http://fatewazut.epizy.com/chura_liya_hai_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/5077333384.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/subabojogetogido.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_60b4088b00cb41e18703ad2ce0193877.pdf?index=trueIn 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_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 5356 bytes
SHA-256: a410e4b36e664eba1b9b03829ffa836e2e47d81c0ffcefa28ecdce31495bb65c
font_01_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 12628 bytes
SHA-256: cf5230fbd94927a814b536a8ee59cba94480551ac2703d1c16eae799cd3b81fd

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