Malicious PDF — malware analysis report

Static analysis result for SHA-256 7166448776596863…

MALICIOUS

PDF

76.7 KB Created: 2021-03-21 09:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0902175688c693ca829e2c981a0d25b6 SHA-1: 233e02d62d5ef3d04fedcaa4e82d029ad512f159 SHA-256: 716644877659686354f02637810be3a5cf62e77ffa9cf8107e9b69f9df39588c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. While no scripts were extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious content or for SEO spamming. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=dark+undine+summoners+war+reddit
    • http://salizurewaki.mypressonline.com/height_balanced_tree_in_data_structure.pdf
    • https://cdn-cms.f-static.net/uploads/4388048/normal_60411be3477d1.pdf
    • https://cdn.sqhk.co/mujipumelebe/c8shggj/pevomuxesifamuwupalen.pdf
    • http://vibolofisef.mywebcommunity.org/best_primo_bottom_load_water_dispenser.pdf
    • https://cdn-cms.f-static.net/uploads/4410415/normal_604ee746d33f9.pdf
    • https://static.s123-cdn-static.com/uploads/4384295/normal_6007b670988fc.pdf
    • http://xorimomupajo.scienceontheweb.net/2373852189.pdf
    • https://cdn.sqhk.co/bojiluxenome/hphcii8/saxobosenupuvifiwegatoxak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mafatiwi.rf.gd/esl_worksheets_with_songs.pdf
    • https://uploads.strikinglycdn.com/files/9019ed5d-b022-42ad-b320-eb7891a4983a/garmin_2699_lmt-d_bedienungsanleitung.pdf
    • https://uploads.strikinglycdn.com/files/e20c150f-e6a4-4aad-813e-196a3ec1a876/77150349963.pdf
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_4b643eb713e048dd819b483bcdc3e342.pdf?index=true
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_611e1c73b4004da9aef3f24acece547c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b729a20f-7982-4a56-a1e1-c927eb9ec5e8/dopugi.pdf
    • http://maxeses.rf.gd/jemanavuwewizusowilubobe.pdf
    • https://uploads.strikinglycdn.com/files/72f570a2-a792-4df1-a8c2-d1095deb3c8e/noziniwabiwegaxoda.pdf
    • http://lafodinozaz.rf.gd/befifemak.pdf
    • http://rodedewezijore.atwebpages.com/26585794241.pdf
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_eab7a9521027491caf134e76358b8657.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cb673f7c-706f-4f0d-b366-42d6de05fb0a/where_can_i_buy_fitbit_versa_replacement_bands.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d876.bin
890bcf8878c3ad4102fdf87133bc13def831b176d805ccf4e13f8c395d43fb86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 5092 bytes
font_01_sfnt_off0000e9c8.bin
013722fc08242e8e83cfa921c70c69ee58777a50e11ccc3cc1ab358afcc48349		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 10616 bytes
font_02_sfnt_off00010e83.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 16092 bytes

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