Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7659c604acdba96…

MALICIOUS

PDF

75.0 KB Created: 2021-04-20 09:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1167396f9aa3ad0a5f1316553382f5f2 SHA-1: 7c93c4cf898750c20c8ab2fb0a08962ea02f0142 SHA-256: f7659c604acdba96c62d7134cb7ad9ae93a4ec93d19a57a15897e6e147c2d71e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable domains and are part of a link farm. The document body, though heavily obfuscated, suggests a lure related to understanding company financials. The presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic indicate a malicious intent to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/strik?utm_term=how+to+understand+the+financials+of+a+company PDF link annotation
    • http://onlinetyz.xyz/capresso_coffee_grinder_repairs8pxx.pdfIn PDF document text
    • http://topstop.site/46069585374v6kig.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/hghHNpb/dragon_city_game_review.pdfIn PDF document text
    • http://chtotakoeverti.biz/elkay_water_fountain_filter_resets9gsu.pdfIn PDF document text
    • http://baby-slings.ru/news_reporter_interview_questionsayid1.pdfIn PDF document text
    • https://cdn.sqhk.co/degamuwubela/hfgjgjk/app_assistant_huawei_nova_5t_apk.pdfIn PDF document text
    • https://ludodufapagita.weebly.com/uploads/1/3/4/6/134616483/luxutirupov.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/ia3ozia/68923005680.pdfIn PDF document text
    • https://wazepitufakox.weebly.com/uploads/1/3/4/7/134735855/fotadawato.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/iiPgggh/pexafetatarotojisitebibux.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/bij5dli/71063620330.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/bIjbHje/redarc_cable_size_and_voltage_drop_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/hbqKifm/87428035453.pdfIn PDF document text
    • https://cdn.sqhk.co/ligilitojob/3gdCGjj/ruxenoralekiwizap.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/dhgJnih/sports_max_cricket_schedule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jezobasit/disney_theme_park_map.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/40452608945.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/75586274712.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/xulawugaravupalufozu.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/free_gospel_sheet_music_s.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_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 5552 bytes
SHA-256: ef9ccf19e2c32e4cd5cda466db5aa81485726bf351ac7f12c884edf5d0b1acb9
font_01_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 10304 bytes
SHA-256: 41ce1079d37b6b97f3dff68859046bc2c80a5487268d847c5bfab2956ebc7a19

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