Malicious PDF — malware analysis report

Static analysis result for SHA-256 884fb51dd141bf04…

MALICIOUS

PDF

79.0 KB Created: 2021-02-21 05:50:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a9ab1274f557eeceb0bdaf0151b5b062 SHA-1: 830a3813ac66ec4a8ce0a6be9231a45b3a0a77cc SHA-256: 884fb51dd141bf04ac0a4bbcfe319c44a3466a0321c464f4bb5748d019bddd73
226 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a credential harvesting lure. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to phishing sites. The heuristic 'SE_MFA_LURE' specifically indicates the document attempts to trick users into providing one-time codes or MFA approval, consistent with session token theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://jacksth.ru/123?utm_term=linksys+ea4500+router+manual PDF link annotation
    • http://worldhold.online/programming_tutorial_csjb2i.pdfIn PDF document text
    • https://pujelewi.weebly.com/uploads/1/3/4/0/134017294/vugakiliv.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/gebikoribe.pdfIn PDF document text
    • http://todayshop.website/ruzadofubivukimuramamexistbv5g.pdfIn PDF document text
    • http://fruct.space/71676399502j3m3l.pdfIn PDF document text
    • https://subutadenurafo.weebly.com/uploads/1/3/4/5/134581349/a403a4a4fda3f.pdfIn PDF document text
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/31f0f9b.pdfIn PDF document text
    • https://cdn.sqhk.co/wudarivat/bhghdgc/mekatudibosenokarakekade.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/02de7.pdfIn PDF document text
    • http://universityru.fun/21101916424vfuaq.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/zubigofaahfa6.pdfIn PDF document text
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/tomemidonom.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/fMELk4a/zero_matrix_vector_multiplication_calculator.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/jazofi/jurumunonekugofok.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/french_present_tense_forms_of_attendre.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_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 5292 bytes
SHA-256: ef1cedfe47a9f86a0c104320293eca9e4c176110cf28b6ad5828843c70f981a9
font_01_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 10796 bytes
SHA-256: a9259eaf44cfaf23ddf5c180c648dd62c55e790891674e34283e4714469659d0

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