Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a7f2d2377a3668…

MALICIOUS

PDF

70.4 KB Created: 2021-03-25 11:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aa0cd04cc235ba86399ff8c7906b1c00 SHA-1: c71c5de7155cb1cbf793baa5a159949b19227470 SHA-256: 88a7f2d2377a3668a797948dfccf987ed0703fecb679eecd25ac69b032de2c98
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of 'invoice or payment language' combined with these links points towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crophysi.ru/123?utm_term=2009+challenger+v6+performance+parts PDF link annotation
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/nupisut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389616/normal_5ff371952e0b6.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/cieicje/stuntman_ps2_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/ggeidie/28352640281.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/pomajuwujofumufo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401694/normal_5fe27fa789544.pdfIn PDF document text
    • https://cdn.sqhk.co/xosuridasago/aHW3r9D/bandi_wear_headbands.pdfIn PDF document text
    • https://cdn.sqhk.co/pukefoxer/C0gfgfP/26025225281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_60226a464b42c.pdfIn PDF document text
    • http://xagigusutop.iblogger.org/52588387811.pdfIn PDF document text
    • http://bobatukuxoto.iblogger.org/symbiotic_association.pdfIn PDF document text
    • http://mavimudig.22web.org/50_essays_table_of_contents.pdfIn PDF document text
    • https://fenorepaxok.weebly.com/uploads/1/3/1/8/131856491/sajagawozoduduli.pdfIn PDF document text
    • http://murupewobot.iblogger.org/85933895897.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muxugozobizesex.epizy.com/mebeguvazofufosatolerebo.pdfIn PDF document text
    • http://xajokaxakubif.rf.gd/nutosu.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_9aa11739c1e44ce2a78d46ef0fde4bc8.pdf?index=trueIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_fd89e21f2fe6464dac04028195b082da.pdf?index=trueIn PDF document text
    • http://zevomes.rf.gd/best_alternative_to_tv_ears.pdfIn PDF document text
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_abb9f673b59a4539bcfb56f4807be98f.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_f59c21e3dc3a413c86c8ea8a77fd25e5.pdf?index=trueIn 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_off0000d0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B5 5980 bytes
SHA-256: 5eee31f54c2464867d47b6b4163f282ae09662245d4acea8ca0ff9c85b5d4463
font_01_sfnt_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 10924 bytes
SHA-256: c93e32158e5c998d9048a5815985a017eb49108545f2c558fb75baf72363c7b9

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