Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99de88152d32a00…

MALICIOUS

PDF

123.1 KB Created: 2021-02-16 20:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a0362d73e97667d6c8c3a4ca76c2484e SHA-1: ad183cb8aa7fcb78aec70d2b43bd4a1755907f22 SHA-256: b99de88152d32a0013c5b783ed9829467c921320c3c89212e3364170c9742b9d
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous embedded URLs and is flagged by ML classifiers as malicious. Heuristics indicate it's a link farm designed to redirect users, and critically, it employs lures for password-protected archives and recovery secrets. This suggests a phishing or credential harvesting attempt, likely leading to malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://leonvi.ru/strik?utm_term=ftk+imager+user+guide PDF link annotation
    • http://cg-designer.xyz/90603990880g98y8.pdfIn PDF document text
    • http://epaytds.xyz/free_android_emulator_lite7pgll.pdfIn PDF document text
    • https://cdn.sqhk.co/papebikuwi/cW6hijb/lidobipesirug.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/gihqtgj/calendar_2020_october.pdfIn PDF document text
    • https://fuvetozexogix.weebly.com/uploads/1/3/0/8/130874326/5534675.pdfIn PDF document text
    • http://mynasert.online/somujamanetufomasosej0jdn.pdfIn PDF document text
    • http://labiosdewonda.com/introduccin_al_anlisis_de_circuitos_boylestad_10_ed41x6d.pdfIn PDF document text
    • http://gigojosok.22web.org/10095410517.pdfIn PDF document text
    • http://beliyden.xyz/kogetatogutapapanixccv4t.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/ijf1gh3/tulolixoxononula.pdfIn PDF document text
    • https://juvifopabolosat.weebly.com/uploads/1/3/5/3/135313118/9280591.pdfIn PDF document text
    • http://voiprormul.xyz/cbre_financial_report_2017vc8t0.pdfIn PDF document text
    • http://vanlit.ru/windows_10_pro_activatormyj58.pdfIn PDF document text
    • http://solerizimifo.iblogger.org/telefono_informacion_trafico_gobierno_vasco.pdfIn PDF document text
    • https://defavelusanopef.weebly.com/uploads/1/3/5/3/135345674/9745785.pdfIn PDF document text
    • https://pawajapik.weebly.com/uploads/1/3/0/8/130813804/gapuge-lumolut.pdfIn PDF document text
    • https://guxemufisi.weebly.com/uploads/1/3/2/7/132710659/luvowawafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00019bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BD0 5132 bytes
SHA-256: b149e68142efc0c89ec6f32166596b299701f846ac5157199bc514822f776603
font_01_sfnt_off0001ad2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD2A 2048 bytes
SHA-256: 0472eb44708e71e092f0964af272a1b75221fbb7776faea76062c81d0662a818
font_02_sfnt_off0001b60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B60F 12288 bytes
SHA-256: 036bbbf761660664ccfe55b82207cb8657c9f925121f4d663c454e3337233efe

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