Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12ad831d7339f69…

MALICIOUS

PDF

78.0 KB Created: 2021-03-21 22:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ed93d97ac3557bd8de14d06172ba180 SHA-1: 750e04462e7fdfb85012010d13917517a082fc3b SHA-256: f12ad831d7339f69d6eedf53bd871948503e256bcd279d1880499a497c5453e0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDF files, suggesting a link farm or redirection mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs, such as 'https://fokemale.ru/123?utm_term=adobe+flash+player+actionscript+3.+0', are designed to trick users into downloading further malicious payloads by impersonating software updates.

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://fokemale.ru/123?utm_term=adobe+flash+player+actionscript+3.+0
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/4211980.pdf
    • https://tetoxoji.weebly.com/uploads/1/3/0/9/130969306/c1f4c5c26.pdf
    • https://fakanodadix.weebly.com/uploads/1/3/4/3/134371587/sevuzuxogevox.pdf
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/suresawuboloriv.pdf
    • https://rebasikerebevo.weebly.com/uploads/1/3/4/0/134016880/wozojinotopawe-tujubabixete-vugujajefil.pdf
    • http://raxawevamavox.getenjoyment.net/zosogarovigetazanisimusag.pdf
    • https://nupewaxupojiga.weebly.com/uploads/1/3/4/0/134042887/998988a98455fc.pdf
    • http://setomomenoku.22web.org/good_gluten_free_snacks_to_make.pdf
    • https://cdn.sqhk.co/duzixulok/gjQ8jfE/niminavapozafinusanufude.pdf
    • https://tulorikuxefuwi.weebly.com/uploads/1/3/4/7/134730127/40f86c380.pdf
    • https://faxarumi.weebly.com/uploads/1/3/1/6/131606834/105f670b1898915.pdf
    • https://cdn.sqhk.co/getabemuto/eIhfcjg/majesty_northern_kingdom_mod_apk_1._0._13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fadezanunadafik.myartsonline.com/graphic_novel_definition_literature.pdf
    • https://uploads.strikinglycdn.com/files/a7a57a2e-63e1-42e3-9322-3f70dfa36a90/quotes_from_ram_dass.pdf
    • https://uploads.strikinglycdn.com/files/2726d863-8762-4cb4-ab20-5dc2617b03f5/biwizewolafegoxuduke.pdf
    • https://uploads.strikinglycdn.com/files/219981e4-6a39-4c22-bbfa-7cbc2082916c/binuxexodinabol.pdf
    • http://wonenuw.epizy.com/madezuji.pdf
    • http://vimozav.epizy.com/college_letter_of_recommendation_from_employer_template.pdf
    • https://uploads.strikinglycdn.com/files/f7d824b9-5c64-4338-a58d-214542c08d57/87868349965.pdf
    • http://nukilaba.myartsonline.com/rilobawiwebifezokugupo.pdf
    • http://tajiroxajesolut.atwebpages.com/agents_of_gender_socialization.pdf
    • https://uploads.strikinglycdn.com/files/cea6acac-b664-4f20-b61b-d6edffa8f138/what_happens_when_rental_lease_expires_in_california.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_off0000f1cc.bin
7bcf8c7d7af6f94ac979c9a41b390c8cde912c3c610fde17bbde4663fc0d828b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 5812 bytes
font_01_sfnt_off0001059b.bin
6f79c1a53be4430d44170c575f1b3d958920cee90817ed321054c447e0cad3ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 10800 bytes

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