Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f462028ba3041e…

MALICIOUS

PDF

90.7 KB Created: 2021-02-18 05:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2e4f80345789d47eb80dae8d702f2b8e SHA-1: d6ae506b9e42d7cfcc8b891defb6c62fd1263c36 SHA-256: 82f462028ba3041ec4c613bf2908ad4706fac1980f9da86f63ad1214d8037c3c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. The document body, though heavily obfuscated, contains text related to physics formulas, suggesting a lure to disguise the malicious link. The presence of multiple embedded URLs and a high ML classifier score further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=pressure+%253D+density+x+gravity+x+height+units In PDF document text
    • http://usecabinets.xyz/blue_skies_irving_berlin_piano_sheet_musicpzp97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488822/normal_5feb6da5a287d.pdfIn PDF document text
    • http://teplotronic.ru/juderekofunutiwose11g74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5fdecb62c1d58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413713/normal_5fc770a8380a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_6028a38e4c4ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_5fcba1d83e6e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_5fe675873759e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_5fd88834dc029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_602b58d896492.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/winumigutam/lakuxuliwunalowiweliwef.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/free_event_proposal_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/botw_divine_beast_vah_rudania_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/76544222822.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/iti_admission_form_2019_haryana_last_date.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/ketimepupukeb.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_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 5332 bytes
SHA-256: e0474b9e3f08e830fe7266bac04bc86440e50a6341120f7dbadec56147270d41
font_01_sfnt_off00013545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13545 11808 bytes
SHA-256: f5bc5d83ef4bfe367d277cd677f537ec9b7a2cb0a37bc3912133a8a8e6a51163

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