Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eaa403e264b6a59…

MALICIOUS

PDF

75.0 KB Created: 2021-03-04 17:58:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 871d660c0e95f53899a446d8b61e076d SHA-1: e1cf7258eb63beb16fbedc3d91d41e3d0e67c14f SHA-256: 2eaa403e264b6a59cf8e1fd78efabff6b791c272be4f552eaf041be971b1b83c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary one pointing to 'druttle.ru', suggesting it functions as a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a pretext for directing users to external content.

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=interview+questions+for+middle+school+counselors PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389603/normal_6036b32df1e67.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/3655682.pdfIn PDF document text
    • http://promoocaoameericanas.com/i_am_who_you_say_i_am_sermongzfkl.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/gotapaduzofavonuxaru.pdfIn PDF document text
    • http://meetlait.pro/wijatofejedalapvf0t0.pdfIn PDF document text
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/ganozoduvagose-jukem-mirupa-dedijukogefi.pdfIn PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/hj8higj/62118881880.pdfIn PDF document text
    • https://sonefexezeripu.weebly.com/uploads/1/3/0/7/130739000/jagimi.pdfIn PDF document text
    • http://peteferix.mypressonline.com/honda_ridgeline_power_steering_fluid_replacement.pdfIn PDF document text
    • http://starconflict-game.ru/87056099075e56rv.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/g7Rpjeu/custom_corrugated_boxes_wholesale.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/cRgcja5/call_of_mini_zombies_hack_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486061/normal_603bcee186f26.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavamikilav.myartsonline.com/what_does_the_bible_say_about_divorce_and_marriage.pdfIn PDF document text
    • http://xewabilema.epizy.com/xirulafalojudi.pdfIn PDF document text
    • http://zasegusof.epizy.com/8929224050.pdfIn PDF document text
    • http://muzezal.rf.gd/assassins_creed_1_highly_compressed.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_off0000e89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 5264 bytes
SHA-256: d4c655d6b3c6c6f2148d98ea8b176b8a614ea576b6f2b7873fbb69c1f7732ffb
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 10484 bytes
SHA-256: a48288120770a607f323560b60ace77642b1f1e8b1046fd83d9308efdba74b11

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