Malicious PDF — malware analysis report

Static analysis result for SHA-256 be74a7fe24165b26…

MALICIOUS

PDF

82.8 KB Created: 2021-03-18 05:24:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: c8956fb06a58b34359532989ba782d1b SHA-1: 556497bbdb4c1ea97238476adc919a744dd68512 SHA-256: be74a7fe24165b26f821d11d22d44dd99483bfbe63c06923b3536518f4c9be22
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating a redirector link to known malicious infrastructure. The embedded URLs and the PDF structure suggest an attempt to redirect users to phishing or malware hosting sites. No scripts were extracted, but the presence of numerous malicious links points to a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=system+analysis+and+design+project+proposal+sample+pdf In PDF document text
    • http://kezekimoridim.22web.org/54235956538.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/epghvO2/87049548643.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/Shgnkko/company_of_heroes_2_cheats_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_603800ab10cd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_60199ca94eab0.pdfIn PDF document text
    • http://xowanopumug.22web.org/sotalalolis.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/jahaChg/87672015725.pdfIn PDF document text
    • http://afracheat8.xyz/20552660770xonlz.pdfIn PDF document text
    • http://metalllift.ru/48640367620ci7sc.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/iaSgcEm/terra_mystica_expansion_scoring.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/ibyYIdj/chromatic_tuner_bass_guitar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_5fdc19770affc.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/S3nhddj/99844524299.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/jgz85ha/speedball_game_drinking.pdfIn PDF document text
    • https://cdn.sqhk.co/gixudokuzaj/KjaCxic/baxijomutegekinunomewu.pdfIn PDF document text
    • http://compte-cmbretagne.best/xerapejumokalowojis1edzg.pdfIn PDF document text
    • http://newsportstechnology.ru/tamilrockers_movies_websites4y9u1.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/7Bmnzgh/you_break_it_we_fix_it_san_antonio.pdfIn PDF document text
    • http://kelirifuwa.22web.org/formalism_criticism_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://repuxatifugupi.epizy.com/thinkpad_l390_datasheet.pdfIn PDF document text
    • http://zirafefovijab.epizy.com/ds_lite_price_second_hand.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_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 5756 bytes
SHA-256: a92d381cf3185991e7c78b082841e87f53024871fb24f68b4e2ff41995c08c38
font_01_sfnt_off0001186a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 10840 bytes
SHA-256: a360bcf0f92bcaecc220ce2ff53fd080c24dadf4f45adc794aaacb629b3fe962

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