Malicious PDF — malware analysis report

Static analysis result for SHA-256 2714799592ba0140…

MALICIOUS

PDF

72.2 KB Created: 2021-01-27 11:04:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1a5317a353df6c9d47e893283ea73bbe SHA-1: 7ff654f3ac902997d5245a41806b9073388efff4 SHA-256: 2714799592ba0140b547be539fbfbd6cee12d3fa9db056e2dc1ed720254045ff
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, and the presence of external URIs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://baarspo.ru/123?utm_term=taxonomy+concept+map+answer+key PDF link annotation
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/5703620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409606/normal_600753b2b5c6f.pdfIn PDF document text
    • https://rotafejejulivis.weebly.com/uploads/1/3/4/5/134599198/23d88ee5c5.pdfIn PDF document text
    • https://cdn.sqhk.co/nubalevuvem/jeSjcih/pevenitomufajorade.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/4446527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415524/normal_60071b8e31608.pdfIn PDF document text
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/1e0ceed0fb.pdfIn PDF document text
    • http://komamoj.22web.org/vodiwibupusob.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagelojuwe/ic0jbNi/kaporixusumarawosaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414500/normal_5fe2893bccf49.pdfIn PDF document text
    • https://cdn.sqhk.co/tigufarejeti/BxjgnGW/form_5_account_bab_1.pdfIn PDF document text
    • https://cdn.sqhk.co/kokowoxiwi/dgfjhNx/gabusimisogawuxosat.pdfIn PDF document text
    • https://kufojinelimipi.weebly.com/uploads/1/3/0/7/130776518/a25c8e6027eb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5fc65db84355a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tosivasode.epizy.com/blanchard_macroeconomics.pdfIn PDF document text
    • http://gewapapis.epizy.com/phone_tracker_for_android_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 5060 bytes
SHA-256: 7079b2ff6a911660e6c25c9d382052f5226292dd811e9a9f8a0458102fd9afa6
font_01_sfnt_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 10528 bytes
SHA-256: 6d8ca0088294da8fd7fca3ba62ac6609d948227449bd20c5f381e39c4c5799b8
font_02_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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