Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bb74103f43db0c…

MALICIOUS

PDF

85.9 KB Created: 2021-03-20 19:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5cbad2b00efcd3184b7f4b2acf10a5e0 SHA-1: b15ba1e92342a8bec6d9fffad37e28a144ef0301 SHA-256: 42bb74103f43db0c031553a19efa254f25302bd0dd5e1ca7719c1a93e6f13f13
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam campaign. The primary URL points to a resource related to medical conditions, likely a lure to attract clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=hombro+congelado+o+capsulitis+adhesiva+pdf PDF link annotation
    • https://cdn.sqhk.co/bizujutenifo/jqajajh/anger_of_stick_4_mod_apk_an1._com.pdfIn PDF document text
    • https://jowujutaxafekul.weebly.com/uploads/1/3/5/3/135348014/jatotegoj_sezazoxi_gexabex_mabusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470526/normal_6046263377e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_6046fb50763f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6030cbe607280.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/cgfgib6/tegero.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/kozotitikejowik.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/iIiihb2/4_pics_1_word_level_2276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421342/normal_6006310a43569.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/ca653b80-a812-4614-a558-e3dd7c70fd65/wugewitigeje.pdfIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_058350e934dc4da7813edf6264dea117.pdf?index=trueIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_ceed92e3170147caacb0c93a4ea27b07.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_cae2e201f1e747f79ef7a91b05a3db2e.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_0c1826efa37b420182fa63641c9a587e.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_12d809446fdf4c11b0fbf0b01ab6acca.pdf?index=trueIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_77bd2e6ee8cc45f6972eea44943cb28d.pdf?index=trueIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_e734aa113edd4ad6a1638659671306aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8529b4-1811-46da-9f28-84b7b3918b77/how_do_i_get_a_religious_exemption_for_vaccines_in_georgia.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_b94a3cf0f88a40ab957828014d726513.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 5728 bytes
SHA-256: d0d5d9b9c6e12c0e877818b3456f1257839663da9273d44193f3edc7913f989b
font_01_sfnt_off00010bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 11752 bytes
SHA-256: 3b14d05ebc7dd39e33ea5821b68ee1601b070e7487731e1441cfa28c333ec58c
font_02_sfnt_off000132bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BF 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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