Malicious PDF — malware analysis report

Static analysis result for SHA-256 90644c9ec287f271…

MALICIOUS

PDF

74.6 KB Created: 2021-03-21 09:31:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 117388f4bdf3f82b31dee060f86a1f15 SHA-1: b348e7deb69fc3a5d5c9e26914c1b46ce7aa4272 SHA-256: 90644c9ec287f271675b1232fb73ab3e28e94044c19462934db3424f3e5744c3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://fokemale.ru/strik?utm_term=the+coldest+city+in+the+united+states PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457318/normal_603637e071963.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/rhhdHWp/planet_fitness_classic_membership_cancellation_fee.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/fhjcbHq/61523974065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381973/normal_5ffbb53ea3009.pdfIn PDF document text
    • http://usesol.xyz/nozonigivadelozosatil5ivg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_60497e38aede7.pdfIn PDF document text
    • http://zerusuwunilex.22web.org/60834989666.pdfIn PDF document text
    • http://idealicaitalia-oficial.site/jakixunuvipigetelitulowobgjn31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_60310ca773cc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456372/normal_6017135c34f18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_60261b606f53b.pdfIn PDF document text
    • http://reduslim-italiaofficial.site/kepifoxunotusaxiwopi2g002.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d158876c-6e6d-4951-a703-f684a6b19254/25052008186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6712d422-9e12-49fb-bfc2-b65245f04eb2/87519702201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d414393-0dde-4338-99b6-f54976e3f80b/how_long_to_cook_chicken_in_vertical_rotisserie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef7a907-629f-475e-8699-309c310433c0/how_to_get_sound_on_google_maps_directions.pdfIn PDF document text
    • http://zixapesuj.rf.gd/rireramazetali.pdfIn PDF document text
    • http://pudubekij.epizy.com/boriwomitigesukinobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f3df6d-0384-4225-8a83-6a33dab5e716/xibatorogepox.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_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 4980 bytes
SHA-256: b0438903e6aae284e67d2001eaebb0e0b7b25a308da6e23ce88343e0a371fd73
font_01_sfnt_off0000f8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 10868 bytes
SHA-256: f142b96d587cf3c2c5d047dd4809b05051f1e4c722657911c3b5cf1c597c869f

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