Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b2b040c131a10e…

MALICIOUS

PDF

59.6 KB Created: 2020-12-18 14:55:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8cdaa3d4413a95710501e21779e6058f SHA-1: 1d5fce8c27540e073ba15999f4a3fb0dfe9ec620 SHA-256: c5b2b040c131a10e1c55409f17abd834dd0df9ce685114e22c58be5216516dff
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to direct users to potentially malicious websites. While no scripts were explicitly extracted, the presence of numerous external URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to redirect users, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=wedding+bouquet+flower+image PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480905/normal_5fbd2dc438369.pdfIn PDF document text
    • https://gobisenuginofaz.weebly.com/uploads/1/3/4/4/134490447/14536737a9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500911/normal_5fc41ec10dbdc.pdfIn PDF document text
    • https://fafugugopogewip.weebly.com/uploads/1/3/4/4/134464831/93f2070e.pdfIn PDF document text
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/detuso_kolab_nududato.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/5835455.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/9426295.pdfIn PDF document text
    • https://fivilogavizizov.weebly.com/uploads/1/3/4/4/134446089/847c7256d8.pdfIn PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/dijijofatusexapig.pdfIn PDF document text
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/7895603.pdfIn PDF document text
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/jugoxabigewiga.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/virelozig-ditesof-xamulazijug-xogodonuvalo.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/lemefofutomapox/53839799462.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/84428285555.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/recurso_del_metodo_alejo_carpentier.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/angularjs_modal_templateurl_not_working.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_off0000aefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFC 5420 bytes
SHA-256: 3c88077707854923b94d46a48635ad3ec1bd6097e357dce61a5e63d1b84ba3ee
font_01_sfnt_off0000c163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC163 9520 bytes
SHA-256: beb16d37a3d0c0688c9fa879342ea323a5d356b5b0dc772b1d9aa36cfec6099a

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