Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18373151f76ff5a…

MALICIOUS

PDF

95.8 KB Created: 2020-12-17 09:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7fb24e946ca4e1644c97561d8eabb1f1 SHA-1: 205ea60daa8f0457ac085a8c5f157daf5daa820b SHA-256: f18373151f76ff5ad0a8092ed41a69af09fe95556b3655ee0a91c5a805ecaaad
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics, including a critical finding for a redirector link and a PDF link farm. The presence of numerous external PDF links suggests an attempt to direct users to potentially harmful content or phishing sites. While no scripts were explicitly extracted, the nature of the link farm and redirector points towards an attack pattern involving user redirection, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=houseki+no+kuni+wiki In PDF document text
    • https://pudafakomixi.weebly.com/uploads/1/3/4/5/134506615/1727063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fd087349276f.pdfIn PDF document text
    • https://zevenaxef.weebly.com/uploads/1/3/4/7/134745307/bumid-dapidazuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_5fc06f341dcee.pdfIn PDF document text
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/vasezafeku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_5fb9a2905a3d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_5fad44ab33dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450519/normal_5fda4c7e8a71d.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/xovupazobagoduv_gabufosisu_kugakeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450731/normal_5fa7d9443f89e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wozoxub/victor_bott_medicina_antroposofica.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/greaves_cotton_annual_report_2017.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 16448 bytes
SHA-256: 161cb0ace1eb3541e303240fdfde3f35d7fa79165aa2f07c4e47cc50deddbdf5
font_01_sfnt_off000130a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A7 4260 bytes
SHA-256: c25016ec69c30669ca94b8c7c4585ace1a1b79820ec6e1b1cbd85568c4f4f139
font_02_sfnt_off00013f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F31 10992 bytes
SHA-256: 8dcf681b49c417e372ccd670c6c780bf95f50dc2ba5e527c5aad46e9c5c45eab
font_03_sfnt_off000163e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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