Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65653237fbc33a9…

MALICIOUS

PDF

80.9 KB Created: 2021-04-18 12:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bbb00bc61a475010c214fffd1339aa80 SHA-1: 2c08d9ca0a8ec0c967d7974e0fef937dbcf0ccb2 SHA-256: d65653237fbc33a9da01e87f820cdbdf2c3f83a6c09e0c7c45d3c5f358f5d964
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=vizio+e480i-b2+specs PDF link annotation
    • https://ruregogawumol.weebly.com/uploads/1/3/2/8/132815787/gerajumupubur.pdfIn PDF document text
    • https://budekimezarusij.weebly.com/uploads/1/3/5/9/135964348/nosusuboxapiwamu.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/jzrzKhc/1203721172.pdfIn PDF document text
    • https://cdn.sqhk.co/tubozejo/Vihmjig/nabarezatuso.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/ifEEihf/29535372068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_6036b45a1c55c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fcbf566581d1.pdfIn PDF document text
    • https://cdn.sqhk.co/lojumisebu/djdp7iw/the_last_survivors_book_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/mewovegid/heibA6i/57942811383.pdfIn PDF document text
    • https://cdn.sqhk.co/bodavadu/ByjeIw0/primal_legends_hack_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/4Xe2gdd/fifa_soccer_2020_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/velizovatim/byigJgj/twitch_streamer_pokimane_crossword.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/1yqmD3D/history_of_hindu_chemistry_book.pdfIn PDF document text
    • https://cdn.sqhk.co/laxegipo/gi4Vbge/sigeferafutigexeti.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/aAzEghg/25629635967.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/2b1f6ce73.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/gxKe5ry/80948042486.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5ff8d9a6143bf.pdfIn PDF document text
    • https://lolijizaw.weebly.com/uploads/1/3/4/4/134461821/6244329.pdfIn PDF document text
    • https://sazeduxawi.weebly.com/uploads/1/3/2/6/132695343/5512455.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/sIgfNVY/xegemokatesuke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/149d0a5d-238c-46d3-a5be-f75cb22074c7/what_are_the_3_types_of_angles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ac956c-0462-4262-b9f9-140ae3aff1c8/formato_de_minuta_de_constitucion_de_empresa_eirl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4798a18c-58d3-42aa-bf70-659c379c8ca8/20199198035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb841b6-d579-4c06-b1fa-a6552f72cc19/22922777821.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 4936 bytes
SHA-256: 38f29e6178abf1ae2ace38f394e1299b735281d14ac34218bb9fabc88cc2c5dc
font_01_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 11548 bytes
SHA-256: ef55c4d0bbff8f8cdb44b351c23a3c253ad1a2cb7f27f0491ae5a50cb16bb97e
font_02_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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