Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a63f35f02605983…

MALICIOUS

PDF

84.0 KB Created: 2021-03-28 04:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b607837e5e037378564a49a6db75f9f7 SHA-1: 7ec07f40b4f1c88a49ba2ef5151589bf899df738 SHA-256: 0a63f35f026059833d3e0798f869260bc66c8c73f4a2a2c308741e69974b5bfe
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, some of which are hosted on disposable domains. The primary purpose appears to be SEO manipulation or directing users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=bacterias+gram+positivas+aerobias+pdf PDF link annotation
    • http://danifewikusi.scienceontheweb.net/ornamental_fish_culture_and_aquarium_management.pdfIn PDF document text
    • http://esclub.pro/sportdog_rechargeable_in-ground_dog_fence_system_reviews9tcyf.pdfIn PDF document text
    • http://all-host.site/emergency_reporting_phone_numberfdp9l.pdfIn PDF document text
    • http://merishwheelrecords.com/kenwood_stereo_deck_says_protecto585o.pdfIn PDF document text
    • http://mnogoturov.com/paxigovolomogavonofuzdw9v.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://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_2e6c0ed63fec4ab29a15fe0f841ed959.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_15a042cd39024e9c9c88631c2c68c2e8.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_150be65c29ab47a6b4d81326e140b7da.pdf?index=trueIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_742df934ffc9486db113db6af83f9155.pdf?index=trueIn PDF document text
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_dffeffc559604d68b644a75c94ab4755.pdf?index=trueIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_0703f69cb2264e36a9b87a125e1e8231.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9faabe-0216-4fbe-9543-f4bd3ec48c29/talelogalozafopebop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0ca33a-e460-4b2e-b44e-ab16ac7bd4ed/jowowidikiduwesujipuvijel.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_6094b7c143c04443b9af11a4f1a7a847.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_be2098231e9d4efeb9ddc615322db638.pdf?index=trueIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_b874165092fd4e18897bfa1077e8422b.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_2ebc87d123424f849adecdcec4b5e1c5.pdf?index=trueIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_468ebcd19744431c91ddd25ac559f302.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_2055b2b3160e461b8bd01ceacf6dd073.pdf?index=trueIn PDF document text
    • http://bokawevetejap.atwebpages.com/18318600711.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_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 5376 bytes
SHA-256: 0da8c3ad6161a248c18b11cf12d036847026d5974e19e3c0dc0a42dab01b2e27
font_01_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 12696 bytes
SHA-256: d33de306ed91814bd9ed9242be8b9ea9b2493721f730128bed13a0f8bdd8e997
font_02_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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