Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f77058f980a7b23…

MALICIOUS

PDF

126.3 KB Created: 2021-02-14 20:05:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04abd434ef33f6305d73289a45ad4275 SHA-1: a9bd09e5cd77bdf2f996736999a59485c201eec9 SHA-256: 4f77058f980a7b23a23d2697c55ae380837b6c50dd6a0de34de2cea7bfee7cb8
186 Risk Score

Malware Insights

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

The PDF document was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of numerous URLs, many hosted on disposable domains, further supports the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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/wb?keyword=appendicitis%20idsa%20guidelines PDF link annotation
    • https://cdn.sqhk.co/fafovewidom/jjnige6/ikea_near_me_pittsburgh_pa.pdfIn PDF document text
    • http://simcars.ru/pathfinder_cleric_feat_guide3gg4t.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/8350746.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/vBFgjie/19212615789.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/fHey8he/followers_assistant_app_download_apk.pdfIn PDF document text
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/bosisiworuxepixaluf.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/187950725750dh5w.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/RXgfcss/xotemebuzaselajazuko.pdfIn PDF document text
    • https://cdn.sqhk.co/sufiwotag/VDjiDGn/drunkn_bar_fight_psvr_review.pdfIn PDF document text
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/mijevekubo.pdfIn PDF document text
    • http://vogeposekuxav.66ghz.com/tivus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mijewuwusos.epizy.com/aplikasi_lagu_free_di_iphone.pdfIn PDF document text
    • http://kowuvemanavo.rf.gd/25162285526.pdfIn PDF document text
    • http://dokelegusipodi.epizy.com/cisco_anyconnect_ordering_guide_2019.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_off0001b217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B217 5132 bytes
SHA-256: a9f8cddd2b11d349bdb90fa1dbc7cd9318fdec5a589f54639bdf10f75ba74e30
font_01_sfnt_off0001c3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3A5 13452 bytes
SHA-256: f0928dcb090f519c76f7589a990cb9eecd5946a7ebafd84e6a62ac3ffbeb97e8

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