Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ce3be36ca258b3…

MALICIOUS

PDF

89.0 KB Created: 2021-03-14 18:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f156f6232b98640fbdfaf880b2924f2 SHA-1: b15ffa022f2263f6330a9e36799df932d0217120 SHA-256: 38ce3be36ca258b307c9b570c4e5e61b6f555979274ec3143a4fde3b99ec4d86
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, with one heuristic identifying it as a 'PDF_SEO_LINK_FARM' containing 30 external links. The document body, though heavily obfuscated, appears to contain product-related keywords ('Sierra designs zeta 4'). The primary malicious activity observed is the redirection to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dugedepap.ru/wix?keyword=sierra+designs+zeta+4
    • https://cdn.sqhk.co/dujagazatad/jcY7iam/woodworker_express_free_shipping_coupon.pdf
    • https://cdn.sqhk.co/puvegipuros/6jjjcYV/cbse_class_9_science_syllabus_reduction.pdf
    • https://cdn.sqhk.co/kikolibub/7hggggZ/jadodijonupefibemufevur.pdf
    • https://cdn.sqhk.co/zejizoguzut/gnWRYhg/96979526821.pdf
    • http://nageramuvepom.mywebcommunity.org/2218465289.pdf
    • http://bebalezuve.medianewsonline.com/nonetazugasoje.pdf
    • https://cdn.sqhk.co/rufebumu/emPXggL/spirit_halloween_hours_salem.pdf
    • https://cdn.sqhk.co/zoxogatuv/jScjhgP/redball_670_sprayer_parts.pdf
    • https://cdn.sqhk.co/dodiniwotud/2wXXjan/88979381739.pdf
    • https://cdn.sqhk.co/kigimijexap/forjche/gunnersaurus_rex_toy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_b0147490da5644c69f2e901fd3f3f74a.pdf?index=true
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_b9f1fd4aee8a43b6a48583d4ebb3ccaa.pdf?index=true
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_6f43812ebb124552837669494a9782d7.pdf?index=true
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_c11c9ff2127b4566b55e7003f8b10d5f.pdf?index=true
    • http://likutolejit.onlinewebshop.net/construct_2_free_license_key.pdf
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_32b0c85f8ccd49c29a7291c3acd27df1.pdf?index=true
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_e471a903d4554abc95e90d6da7bc7529.pdf?index=true
    • https://s3.amazonaws.com/miwolezedubujoz/99496532903.pdf
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_9993c40fb5d04d7c86611f6d9c01680d.pdf?index=true
    • https://s3.amazonaws.com/sinamozagemoger/boroge.pdf
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_3a62bdb3a7754e99ac3f1db442019094.pdf?index=true
    • https://s3.amazonaws.com/wobuzisibal/tixodep.pdf
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_5cfa130721ec4c659eba72a0208bc188.pdf?index=true
    • https://s3.amazonaws.com/mafavuzenoliki/bixurezomus.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_off00011f71.bin
cbde405772319c8db3d13b2850313d857d71bb6e2bb83f08b56426d79c32ea50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 5200 bytes
font_01_sfnt_off00013137.bin
a4a3ec5ffa2b7e0d731da3ef82d459fdf10c610c7b9fee942ed2f15cfada3a82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13137 10992 bytes

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