Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7edefe4383402f…

MALICIOUS

PDF

79.0 KB Created: 2021-03-09 13:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c2e8d0286831bbd454c2f201086b1a9 SHA-1: 5de15d27d61e89c256a450c8cb923c68ee1fce53 SHA-256: 3f7edefe4383402ff11fd7cabf97d4ed4173ebd7845b228c0ecde1439d98b9a5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One prominent URL, https://jacksth.ru/123?utm_term=ohioguidestone+columbus+news, is directly embedded and likely serves as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution scheme.

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://jacksth.ru/123?utm_term=ohioguidestone+columbus+news
    • http://giwudogor.scienceontheweb.net/xigudis.pdf
    • http://gekodejevotug.medianewsonline.com/27009091979.pdf
    • http://fofolep.mywebcommunity.org/69933724192.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dewutexorob/certified_mail_form_3800_online.pdf
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_161d6ec517a340c48e9f7f8e7c5444c1.pdf?index=true
    • https://s3.amazonaws.com/bupesejirijejus/how_to_check_target_visa_gift_card_balance.pdf
    • https://s3.amazonaws.com/takurugilij/bs_date_format.pdf
    • http://fararisujis.myartsonline.com/94891786364.pdf
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_68d2d6eabfde4193b29b1b2e6c4cf805.pdf?index=true
    • http://zisukuvi.atwebpages.com/59767061112.pdf
    • http://widifusi.myartsonline.com/gatabodumiboletaw.pdf
    • https://s3.amazonaws.com/tolivajupeku/98939325986.pdf
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_45eb1a01265f4ef1ae28dc4bc1c0392a.pdf?index=true
    • https://s3.amazonaws.com/wovedukevikov/47123349958.pdf
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_7f3ae114b3cb47de9082f45c7584ce7f.pdf?index=true
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_0c4f4f3e691148a7bec12027856da51f.pdf?index=true
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_6dcdc3f7a4354c1eb9e83a08c86ee3ac.pdf?index=true
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_cd2d7144e4814301ab433e1f52ece0ae.pdf?index=true
    • https://s3.amazonaws.com/xofalepelala/lesanegevofu.pdf
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_696ceaee629a4931b52b9eb935135fc4.pdf?index=true
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_27397b0a30d64f84a0e907e628f58f66.pdf?index=true
    • 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_off0000f837.bin
3ac85f759d39b7343933309691c373ec87151b3dc05fa210e6269298d63e43f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 5304 bytes
font_01_sfnt_off00010a2f.bin
692987e4274283c99ed822a8354133a7441f831c902d747900717cc37b0b58fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 10788 bytes

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