Malicious PDF — malware analysis report

Static analysis result for SHA-256 5479877703f14908…

MALICIOUS

PDF

78.7 KB Created: 2021-03-30 15:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0ec16cbee83f08a5f3866f9fdd7c2546 SHA-1: dee28c07a8030011ba6cfffacbbe6ae98e516b4c SHA-256: 5479877703f1490862067eadefcaaf4dc9003ff48aeaf7c6f68206e13b82772d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains references to a 'Laserjet 3015 service manual' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to disguise malicious links. The presence of numerous external URIs, many hosted on disposable domains, further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=laserjet+3015+service+manual PDF link annotation
    • http://rimka.xyz/kimon_nicolaides_the_natural_way_to_draw_reviewozuye.pdfIn PDF document text
    • http://com-connexion.xyz/nao_vai_saber_o_que_fazer_quando_a_bad_baixar_letraod5cr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470835/normal_5fda3ce2d9390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_5fcb75a622adf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379610/normal_6004da3e2c145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478131/normal_60504db3b36bf.pdfIn PDF document text
    • http://repair-kompov.ru/what_is_the_best_scripture_for_encouragementihryi.pdfIn PDF document text
    • http://perexifolelave.iblogger.org/24763021625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5fe303abbe98c.pdfIn PDF document text
    • http://fujabaz.iblogger.org/jovupedenuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426819/normal_60458278e3fd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383806/normal_5ff5462e6b188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5fd0e74898a60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_b2549027e6f144058a36dfa2639c11e1.pdf?index=trueIn PDF document text
    • http://wumoxafu.epizy.com/spelling_for_6th_graders_worksheets.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_b6b0c39105334c338a5377acdd543ba8.pdf?index=trueIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_a72206e66364402eae4b58cfade5ecb7.pdf?index=trueIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_105ea7c94dc44aea944b1d628c9cceff.pdf?index=trueIn PDF document text
    • https://d6a293f2-6876-493d-91b7-c13182b05023.filesusr.com/ugd/bcaa7e_68ed2af6dc6f494c830bdb7e2671f6bf.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 5504 bytes
SHA-256: 7f5dd0031249e26d2b744ee502e9314d6a7bbe29984fbaccc4fbb293ec020d65
font_01_sfnt_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 10592 bytes
SHA-256: 2ea4e06a3e21a95fd7b058814337b86a12fc5feadfa27b986c676b3338f95648
font_02_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 18104 bytes
SHA-256: 62a1509e83e77d4170fbbbd692e69486cbb5e41dd1f668b92ba3d8566f69f3ac

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