Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e4db235dfff07c…

MALICIOUS

PDF

77.7 KB Created: 2021-02-25 16:10:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 944afe36a6f229987c9d679b138f4e29 SHA-1: 4d31f7a527b5ef7c5ef7081e6a83f6ca8e616efd SHA-256: 89e4db235dfff07c25cf9b36b610fb4be7dc33aa9f5bd854d29d5c29c1cf7b90
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least two pointing to potentially malicious domains ('bologen.ru' and 'niwujobexev.22web.org'). The presence of external links and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://bologen.ru/aws?utm_term=stock+market+closed+today+india PDF link annotation
    • http://niwujobexev.22web.org/nokozixu.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/fS5jdig/diep._io_hack_android_download.pdfIn PDF document text
    • http://ses-paypal.com/509543966158vnle.pdfIn PDF document text
    • https://cdn.sqhk.co/turanexode/mxtQogg/juventus_fc_schedule_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_60362381ee1f3.pdfIn PDF document text
    • http://msertis.xyz/sawewofozufafebajidopozp0fl.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/iglulic/cdc_zombie_survival_kit_list.pdfIn PDF document text
    • http://lianhua.life/30341532012tyvtx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_60109ae537ac2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5fcb20e9bda8f.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
    • http://tagitefidunun.epizy.com/noxxa_breadmaker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/vunawinomomanajuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/cavalry_scout_uniform.pdfIn PDF document text
    • http://zoriwotub.rf.gd/50880957090.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/hungry_shark_heroes_mod_apk_2._3.pdfIn PDF document text
    • http://zugotival.epizy.com/carboxylic_acids_esters_fats_and_oils.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 5140 bytes
SHA-256: 253f7baf94b801ad5ea6cfbb4a73a1c20f6604dec7480d7bfdccc205c609e67c
font_01_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 11068 bytes
SHA-256: d89fd15a94d6b898caccb0ba39abf29f7e2dd63e7f0918aad7cd933c7771e0ee
font_02_sfnt_off00011bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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