Malicious PDF — malware analysis report

Static analysis result for SHA-256 880db98f77031991…

MALICIOUS

PDF

91.3 KB Created: 2021-04-21 08:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 77656e2aa4a1876f14851adeb7ba6534 SHA-1: dec8076fa705e02b8430044ebd7896d3b6d79aa6 SHA-256: 880db98f770319912c745cd88ea8cf6a8a8a2453225034c157c905fd995aa126
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of multiple external URLs suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=example+of+new+historicism+criticism PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449421/normal_6047286505d74.pdfIn PDF document text
    • https://gakokoxexoboj.weebly.com/uploads/1/3/0/7/130776672/325240.pdfIn PDF document text
    • http://smartcreditus.info/best_comfort_infrared_quartz_heaterhe1gi.pdfIn PDF document text
    • https://lixijuzi.weebly.com/uploads/1/3/4/6/134626773/2781872.pdfIn PDF document text
    • http://allerlo.xyz/viwexozedohw54u.pdfIn PDF document text
    • http://physcoo.com/english_worksheet_possessive_adjectives595d0.pdfIn PDF document text
    • http://politach.com/sharp_carousel_convection_microwave_instructions34l6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413227/normal_60415d0d483f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504791/normal_604ac85c53e5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392661/normal_60011e8beb385.pdfIn PDF document text
    • http://fherixq.com/htc_m8_factory_reset_not_working4etp7.pdfIn PDF document text
    • http://verifybadgesbusiness.com/dungeon_and_dragons_adventure_booksczbag.pdfIn PDF document text
    • http://devlp.design/my_server_is_not_responding3f0n9.pdfIn PDF document text
    • http://rankingcoach-apps.com/23705250805ankxg.pdfIn PDF document text
    • http://koolmaxt.online/55758350520u5p2e.pdfIn PDF document text
    • https://jegewovujukevu.weebly.com/uploads/1/3/4/5/134507091/4456262.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/povodijirig/hitman_s_bodyguard_full_movie_moviescounter.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/ragnarok_m_aldebaran_minstrel_answer.pdfIn PDF document text
    • http://zedobalulir.epizy.com/toefl_speaking_test_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/lightroom_cc_mobile_tutorial_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/kokibawogiwasevozapuso.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/72156273608.pdfIn PDF document text
    • http://gelanuvefod.epizy.com/diliwevisegojo.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_off00012950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12950 5372 bytes
SHA-256: 5bd71e052e1c172be3a5e0871b98ec3abacdac4866521a02b4a50071017d8fe3
font_01_sfnt_off00013b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B87 10796 bytes
SHA-256: 541388d8d8030213963bb138d7effd1d12d9a4cf5be6fcc6af8c2610d6e11e15

Open this report in the interactive analyzer, or submit your own file for analysis.