Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf4518015a3a040…

MALICIOUS

PDF

89.9 KB Created: 2021-04-05 06:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 53fe33e49312b16ed552939bc51cfb4d SHA-1: 26b5a6fc239706c1e687a25e2850e25157957841 SHA-256: aaf4518015a3a040aad3ba3c7a409acb7a3aa9d53966b0dbc8ea2224668b266e
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to manipulate search engine results. One critical heuristic indicates a direct link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=adobe+acrobat+pdf+free+download+for+windows+7 In PDF document text
    • http://bapatavusirave.mygamesonline.org/69177788209.pdfIn PDF document text
    • http://ponemofetu.scienceontheweb.net/ameda_breast_pump_manual.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/69283294249.pdfIn PDF document text
    • https://fadatofi.weebly.com/uploads/1/3/1/3/131381363/d54ac.pdfIn PDF document text
    • http://zagozogenef.sportsontheweb.net/tesikuvovaruvonutu.pdfIn PDF document text
    • https://ganepivojo.weebly.com/uploads/1/3/4/7/134774155/ginaj-wetil-wegefa-javiko.pdfIn PDF document text
    • http://kufejat.sportsontheweb.net/sirotufunomojupomixejog.pdfIn PDF document text
    • http://lewuvumo.sportsontheweb.net/who_are_considered_gatekeepers_in_the_bible.pdfIn PDF document text
    • https://nozojotama.weebly.com/uploads/1/3/4/5/134585139/e428e.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/18059535214.pdfIn PDF document text
    • http://xokebidukefu.getenjoyment.net/fetejukiwivejututedew.pdfIn PDF document text
    • https://jawuzomave.weebly.com/uploads/1/3/4/6/134660074/nusibamuzuwatid.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/71e6f844-8f7b-4eb0-a5de-b554879e2ac4/keeping_god_at_the_center_of_our_lives.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_eabeb7b188284a018f46830df9474684.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddae555-c084-40b9-834e-adbdcbc32b74/vusifezuvenet.pdfIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_c89d37239b204687a52debdd150dc9f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e801c03e-c9c8-4502-a78c-c3891c8108ac/rainbow_magic_book_series_reading_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab9c7ea-175f-4603-a1e5-3369d7222455/ti-83_plus_ce_specs.pdfIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_589098652c05453bb728971d5949a27a.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_8c6f6b80ed914c5886f9415c06a3f8af.pdf?index=trueIn PDF document text
    • http://japamitafixe.myartsonline.com/how_to_get_throw_up_out_of_clothes.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_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 18404 bytes
SHA-256: 148a02c9be99d67e33c7401c000c8e6b865ec459dd9e7178271c5030c4598cef
font_01_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 5448 bytes
SHA-256: 41506f9c883749d77ca1fbd9eb0b988db34e7ec7e21cd4aa4b3e846ea3e9d5dc
font_02_sfnt_off0001328f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 10744 bytes
SHA-256: 3884381e442cb34f83f40a4af7ac3734e26584f0f7a38044646163431dcc3189

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