Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fc9c3623040c1f…

MALICIOUS

PDF

73.0 KB Created: 2021-02-25 06:12:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1cc0fb8d7c54caa9f46a1d45791b22a3 SHA-1: 0829d05b69d195438c322456d2e9f2dfa243d692 SHA-256: a5fc9c3623040c1f4e9f0b12deec631eaaab3a0295839f7134dacc1a71479806
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a large external PDF link farm. The ML classifier and ClamAV also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically. The primary attack pattern appears to be the distribution of numerous external links, likely to host malicious content or engage in SEO manipulation.

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://leonvi.ru/strik?utm_term=what+the+bible+says+about+mother+in+laws PDF link annotation
    • http://lastasked.com/meme_generator_pro_patched_apk6nnjr.pdfIn PDF document text
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/3127228.pdfIn PDF document text
    • https://rupugafes.weebly.com/uploads/1/3/4/8/134847604/nipefu.pdfIn PDF document text
    • http://gukimunejorupod.iblogger.org/54689189136.pdfIn PDF document text
    • http://foluxokifoni.22web.org/taxabezetegapob.pdfIn PDF document text
    • https://najunewuzerus.weebly.com/uploads/1/3/1/4/131408250/24c3c.pdfIn PDF document text
    • https://nadagedo.weebly.com/uploads/1/3/1/8/131858166/pugowumobep.pdfIn PDF document text
    • https://tajirokobi.weebly.com/uploads/1/3/4/9/134901714/569167.pdfIn PDF document text
    • https://bupimapigi.weebly.com/uploads/1/3/1/3/131383283/wevewixij.pdfIn PDF document text
    • http://wedavinonuvovu.22web.org/white_christmas_trumpet_sheet_music.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/patipimufusi.pdfIn PDF document text
    • https://duzigolanulemo.weebly.com/uploads/1/3/2/6/132680867/2b0aaa7a3.pdfIn PDF document text
    • http://cetop.xyz/90837259006zkrr5.pdfIn PDF document text
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/647730b43580.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/ragejufa/32919568285.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/3022524081.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/notification_icon_not_showing_android_marshmallow.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/poval.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/oxygen_os_poco_f1.pdfIn PDF document text
    • http://bikaxubu.rf.gd/cerebral_palsy_ataxia.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_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 5272 bytes
SHA-256: b49ef1e574d7f27fc45d14348cf3172c62415c5e05151f797e13a8f0147fb5ff
font_01_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 10732 bytes
SHA-256: 8cdd22f814860abc8b097622df38b11d3a111ac8be95581e32651594e058808a

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