Malicious PDF — malware analysis report

Static analysis result for SHA-256 a184415efed3415f…

MALICIOUS

PDF

82.0 KB Created: 2021-03-24 20:56:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 169c3949ef25a32fd585a001ec3c5b0a SHA-1: a9c145236508edd6190a918aaa571775779c09be SHA-256: a184415efed3415fa6c71e7b40abf5d5877d310f8800c5f280c996a8c6ff6fbf
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://vilenefex.ru/123?utm_term=free+comic+book+app+android PDF link annotation
    • http://reduslim-siteofficial.site/the_fourteenth_goldfish_settingqumsh.pdfIn PDF document text
    • http://akb54.ru/what_is_popular_culture_in_geography5mi9w.pdfIn PDF document text
    • http://monstergym.ru/mulanidogaminugosasedijuvushr8.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/stihl_battery_operated_weed_eater_price.pdfIn PDF document text
    • http://fesunasisodenod.getenjoyment.net/mandarin_chinese_english_bilingual_visual_dictionary_dk_visual_dictionaries.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/111792877729cbk3.pdfIn PDF document text
    • http://goldenframecollision.com/93421617069djg3h.pdfIn PDF document text
    • http://teksalle.xyz/sokuxozagivudalowizifujmqxal.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/18012949768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojawesepex.rf.gd/28452829559.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_92d4b861024a4e02b42c98d9d6fc63a9.pdf?index=trueIn PDF document text
    • http://gokixedotoj.epizy.com/table_html_template.pdfIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_7c7add995e614c12b3aa7091b4479bc4.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_22ff9501ed7a418089627cb18874926d.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_e5c869c32efa4f5fa5680220db660970.pdf?index=trueIn PDF document text
    • http://fenajewo.rf.gd/a_book_of_beasts_and_buddies_sasquatch.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_42e68ba3a229429b90ef458652f4c1c9.pdf?index=trueIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_8489c3a968d44e31b9ab8346187ab291.pdf?index=trueIn PDF document text
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_ecc4f47943af4f5fb616041a9467235a.pdf?index=trueIn PDF document text
    • http://ribobejan.rf.gd/75051258298.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 5168 bytes
SHA-256: 28cf6b019bd6fc845da5fce1304a084b9876c6ee44a4da04d96231e4e9003387
font_01_sfnt_off00011503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11503 11220 bytes
SHA-256: de3b698814f250b6708bacc02dde8ff12712164d7e6c58deaa9af13a37c30667

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