Malicious PDF — malware analysis report

Static analysis result for SHA-256 004adf5d6d11612e…

MALICIOUS

PDF

120.7 KB Created: 2021-06-13 02:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1fa0f9e060460171eba406ef6b50a244 SHA-1: 52809fb4c42764554f0f8c5e384780242e93f4b6 SHA-256: 004adf5d6d11612e8c481ae8e17146ce6e9594f6cf4a2f44677cd9db0285c408
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'coretry.ru' and using 'nrsv+study+bible+pdf' in the query, suggesting a lure to disguise the malicious nature. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of hosting multiple links on disposable domains, often used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/pbw?utm_term=nrsv+study+bible+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410443/normal_6040e30feb9ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464323/normal_603439149811d.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/bowefilak_resim_lafudelituwili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418583/normal_602442fe71e38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417403/normal_5ffbcd419e9aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488555/normal_606cad84e77c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380674/normal_5ff8adc5910c7.pdfIn PDF document text
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/9d62e2d4.pdfIn PDF document text
    • https://likunemotiro.weebly.com/uploads/1/3/5/2/135299998/jizatupulisamor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_5fc802cbc5090.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449192/normal_5fdd3f4e8412a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_60199e67da21c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144619278/71689771256.pdfIn PDF document text
    • http://lodenapokot.pbworks.com/w/file/fetch/144781395/what_does_it_mean_when_my_kenmore_stove_says_f10.pdfIn PDF document text
    • http://lomades.pbworks.com/w/file/fetch/145219476/frosty_the_snowman_story.pdfIn PDF document text
    • http://memofemovo.pbworks.com/f/lomamosolujopegevokave.pdfIn PDF document text
    • http://sebevowan.pbworks.com/f/gymra_full_body_workout.pdfIn PDF document text
    • http://nikekuva.pbworks.com/f/45943428553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86d8680-c3b1-4252-ac76-e87c9357dd12/busomusiniv.pdfIn PDF document text
    • http://kesowununak.pbworks.com/w/file/fetch/144983349/demon_slayer_manga_chapter_26.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02326e4d-2fc5-44e1-aef7-e893cd41b388/ritifofezom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7adc085d-4e18-455d-861d-4f71ed34ba3b/63963854967.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_off00019b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B7D 5096 bytes
SHA-256: 3b7da93a826e90451df00ec03fc6c367c35172fa47f33f3cc7965ce3ae682134
font_01_sfnt_off0001acef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACEF 11764 bytes
SHA-256: eae512d9a4cccfd6d3a86803d0b443275981d4c082f1fb8b50ebff7b25c36492

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