Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f26c3fc671b281b…

MALICIOUS

PDF

83.1 KB Created: 2021-04-05 16:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0a72724e9a7d19b9bac9f8e4e657332a SHA-1: 898662c0ac929799cea92b160372771dea59d808 SHA-256: 1f26c3fc671b281b0db71ba4eb10eff3a074b3757bf0ed6ef8a5bceb3f61aaa1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/aws?utm_term=what+is+the+role+of+most+chlorophyll+molecules+in+a+photosynthetic+membrane PDF link annotation
    • https://dosoxikovere.weebly.com/uploads/1/3/0/9/130969917/vivajidabuzulumel.pdfIn PDF document text
    • http://sasujunine.iblogger.org/pierre_bourdieu_biography.pdfIn PDF document text
    • https://jidisoluko.weebly.com/uploads/1/3/6/0/136097174/porurap-gafet-budanegefepon.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/baaghi_movie_videoc0jse.pdfIn PDF document text
    • http://doporujela.iblogger.org/88939087468.pdfIn PDF document text
    • https://jadilibetaz.weebly.com/uploads/1/3/4/8/134871175/b6c2e69b353.pdfIn PDF document text
    • http://fb-ig-violation.com/top_10_praise_and_worship_songs_2020vhrk9.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/zulofugumonotaxibus.pdfIn PDF document text
    • http://jetolad.iblogger.org/45434446038.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/7542236.pdfIn PDF document text
    • https://vawoxaju.weebly.com/uploads/1/3/1/3/131379227/gutemofima.pdfIn PDF document text
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/ridim.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/2378194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_78516b3614dc43849855846ea7aaef9c.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_a3d158c52b9a4eb79854975af6a387dc.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_0bc3408790bc40f0a9f0125cdd629a7e.pdf?index=trueIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_1ed0d3ee76a04a0cafd35641e386927d.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_b6990cded6d744a490f0745f392573e9.pdf?index=trueIn PDF document text
    • http://farapatenaru.rf.gd/onn_roku_tv_32_inch_wall_mount.pdfIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_fbf53944efe840e0a51155b41d26b62b.pdf?index=trueIn PDF document text
    • http://gumupomomoripu.rf.gd/40mm_bofors_gun_manual.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_933275c878e74d76a6bfa0a0034e411c.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_b7569ea39984496bbccc7f5808c8b72a.pdf?index=trueIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_e3e5c3bc3e8d40388aedb90d8e0bb8ba.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_f01a321e8bc540cc9033ce8d544f43ef.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_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 5508 bytes
SHA-256: ea7fd58ee1e38ebe5b8eea558779cf703b4ee82eaaac60e0f0841a0d9bade857
font_01_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 11672 bytes
SHA-256: d1247685f3f3277ee87ac8a1ba3566f34dcc314e67270e10938b31c65a7f4f4d

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