Malicious PDF — malware analysis report

Static analysis result for SHA-256 4174261ba2e07013…

MALICIOUS

PDF

84.1 KB Created: 2021-04-06 15:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab5d6b7ce651c7086eb5466ccdc63c4a SHA-1: 26510f393e650e1273bc808c2c58b3309ebe758e SHA-256: 4174261ba2e07013c9064e8a286edb932db64ca8f18efbb5a1cf040a9605a217
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a site related to alarm replacements, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wix?keyword=replacement+for+costar+carbon+monoxide+alarm+model+12rv-db
    • http://zakewabo.scienceontheweb.net/casio_collection_mens_watch_w-735h.pdf
    • http://kixuredatuzafu.22web.org/ba_1st_year_philosophy_book.pdf
    • http://xuroriwonufuz.scienceontheweb.net/how_to_port_data_from_android_to_iphone.pdf
    • http://raxawevamavox.getenjoyment.net/amazon_annual_report_2020_16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/780b82fa-564c-43a8-ad70-4bfcce7f1956/pisaxum.pdf
    • http://kawerulim.onlinewebshop.net/gedidejatoka.pdf
    • http://wijixetav.epizy.com/nunamesunoposavirarodob.pdf
    • https://uploads.strikinglycdn.com/files/6c8fe785-5d57-4da2-af97-809cd01813ae/82361685930.pdf
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_7e8ff989abf14436a13bc2a954422919.pdf?index=true
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_0f2100779bd2458db09b90e7496f6ea0.pdf?index=true
    • https://8aa13d94-a051-4bfa-911d-5e7c2f772018.filesusr.com/ugd/382cc4_1f243ff04cd14968b673aed58fe15aec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cd8c70a9-c015-4688-9e9e-7450907f88eb/36560221914.pdf
    • https://uploads.strikinglycdn.com/files/81390a90-1330-457d-b3a2-2369ce8d6310/everything_is_illegal_in_singapore.pdf
    • https://uploads.strikinglycdn.com/files/87d587b2-440d-49e9-add0-0904a21d08ee/78902548875.pdf
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_7231cd0b68484b24a2e1b7822f3a5dd7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/009aa189-b151-4f5a-b1f4-bfe6ee8f0a68/zuzinop.pdf
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_0c67afe3f375472196f3cb032a2bd1cc.pdf?index=true
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_8f0f200f49b3407c8a7bc4faf76431c9.pdf?index=true
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_2ecc32584faa45ab94eefcb0a59c8713.pdf?index=true
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_6a9fc143d00c49c2b901b6c0612ffb32.pdf?index=true
    • https://uploads.strikinglycdn.com/files/31c4b257-5006-4753-859d-5aa666f1f57a/what_is_management_essay.pdf
    • https://uploads.strikinglycdn.com/files/07ed2350-6c69-4d26-a711-067d4ddd2b9b/geometry_chapter_7_test_answer_key.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106bc.bin
1ca69eacbf93d5b647d54abe40ec52feafdb42e8de0f1691630a1ce862ce9444		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 5792 bytes
font_01_sfnt_off00011a6c.bin
5a60825b2139f3c5117db1322f4fcbde27f6d384253d18c6a2a3d54de07964c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 11100 bytes

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