Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25559c7b78377f1…

MALICIOUS

PDF

82.0 KB Created: 2021-03-23 18:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f99b3c51a09eac45b615b2e2fb526fda SHA-1: d1cb97f9fe172f14d350a5879063da48c7b6e320 SHA-256: d25559c7b78377f1f43458cb096441b3b46284fcedd55aecb85e18980c7352c6
156 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically mentioning callback phishing and payment redirection. The embedded URL `https://midufefew.ru/award?keyword=financial+accountant+cv+pdf` suggests a lure related to financial documents. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://midufefew.ru/award?keyword=financial+accountant+cv+pdf
    • http://reliables.ru/951033989671sv2l.pdf
    • http://khanapoorti.com/distinguish_between_effectiveness_and_efficiencyibd2z.pdf
    • https://cdn-cms.f-static.net/uploads/4450870/normal_602246f1aae08.pdf
    • https://cdn-cms.f-static.net/uploads/4428062/normal_602088a339817.pdf
    • http://madewithsunshine.com/chemistry_final_exam_answer_keypzr78.pdf
    • http://rubeatyshop.xyz/79826598347wzuba.pdf
    • http://outputqwvk.space/cuantas_paginas_tiene_el_libro_cronica_de_una_muerte_anunciadacfyc7.pdf
    • http://academic-club.ru/bojolimiwinepmfz61.pdf
    • http://cmbmarketing.agency/jojewulatasakidppd2.pdf
    • http://trychambre.xyz/baby_shower_nia_ideas_manualidadesvdjvh.pdf
    • http://wepirafigezatid.22web.org/worksheets_for_kindergarten_halloween.pdf
    • http://huaweistoreukr.xyz/zawagerijalajurerepitatneup.pdf
    • https://static.s123-cdn-static.com/uploads/4369163/normal_5ff7c65d2c0c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_c59adf619078422f8727e3e91f5694df.pdf?index=true
    • https://s3.amazonaws.com/panalipolifod/vuxulo.pdf
    • http://gepuwuvezu.epizy.com/big_blue_live_pbs.pdf
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_5aaacab0abcf4745b2c9b7af3c77a509.pdf?index=true
    • http://lezegunotoxom.rf.gd/calvert_county_md_sheriff_reports.pdf
    • https://s3.amazonaws.com/feliso/legend_of_zelda_link_between_worlds_guide.pdf
    • https://s3.amazonaws.com/purawuma/guideone_insurance_jobs.pdf
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_5300bba0a31e438bba59653e44082e85.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c1.bin
b2ff0fb18fb310451d0f7a105b87227b4610ef362f4b930254bc31e7978b00d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 4652 bytes
font_01_sfnt_off0001049e.bin
adea8791e4b60fddc75b4b688e1abcfa7e5a6beffd01098644b2ca1d874b0658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 11388 bytes
font_02_sfnt_off00012b17.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 4324 bytes

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