Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a02f0e84671694c…

MALICIOUS

PDF

71.6 KB Created: 2020-11-17 18:28:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 707becd6c7d5b42a94266b016a8cf855 SHA-1: d51d190a064ce1860d166d687b49ebc1220ce380 SHA-256: 0a02f0e84671694c56a9160ff629c2708042d3bcb259518e9dbc48f25087c153
222 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of numerous external PDF links suggests an attempt to create a link farm or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?utm_term=multisim+11.0+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f94a1f748aa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_5fa3d9fa02430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5f8de609aa910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_5f9a527f8f634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421959/normal_5fb01ba7238e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5f896b9911dbf.pdfIn PDF document text
    • https://xukutejupu.weebly.com/uploads/1/3/4/4/134487517/megoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5fa30a1ee343e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_5fa412199cffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_5faf124e673ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b61a39-5159-4cab-8b16-35b9939e4b4c/64727344994.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/33400231109.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/volume_of_prisms_word_problems_worksheet.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_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 4756 bytes
SHA-256: 81e27a27ee6ea72001ccf171b3776a5ad0f35a40ed91282b8077f9bbf8c2a569
font_01_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 10892 bytes
SHA-256: eb76049d4b5ec406efb1209e835508a4946a5638f08ead1e7e37899b04d71abc

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