Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0f458f58e8a09e…

MALICIOUS

PDF

69.9 KB Created: 2021-03-23 09:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d8e48528df0022bbc7934f6ad6b1d54 SHA-1: 185e23e83f3c369b76cbdd93b69dc95fb0d0741d SHA-256: 9d0f458f58e8a09e229c8269d8eaf3a4c4c5048c5890712091bc4aa7caf51cfb
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains a large number of external links, with one pointing to 'jacksth.ru', suggesting a link farm or phishing attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=vygotsky%2527s+educational+theory+in+cultural+context+citation
    • http://goshop32.site/418829456598wl4p.pdf
    • http://winoorama.website/tezolodonetikaxavaxikalxw4ef.pdf
    • http://ezfix.asia/54977248992pbewv.pdf
    • http://twoup-viktoria.online/kirogajevefitowokuzudutudn2wk.pdf
    • http://kvyovk.xyz/how_to_pair_merkury_bluetooth_earbudsao7jy.pdf
    • http://ca-manalapan.space/zolemokudipidujupiwufi20s6b.pdf
    • https://ponigeje.weebly.com/uploads/1/3/0/8/130874529/xukomudokifakelafi.pdf
    • https://xatikofaf.weebly.com/uploads/1/3/0/8/130814669/782899.pdf
    • http://docita.fun/physics_objective_questions_and_answers_class_9_in_hindihpwpt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b080b5c9-6567-4aa0-8b12-0d3479300425/bidewutimulesugipozig.pdf
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_72686d2c33ca4f0db480e669393ed4da.pdf?index=true
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_624888a061174bffa05531e7800a857f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab4ab8f3-1d91-41be-938d-af00d04478af/what_did_erwin_do_to_esther_in_the_bell_jar.pdf
    • https://uploads.strikinglycdn.com/files/bb730494-6587-490c-9a1e-4b4775378bee/64602293060.pdf
    • https://uploads.strikinglycdn.com/files/61929b0a-7ab6-45dc-af15-e1a6746720b3/15562238571.pdf
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_8ae05d57fcad4103937a082f104a2446.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_off0000d4b9.bin
55211c8a59091041279a87fe0177585a4caca723f6a01e31af35fddd23c73c64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 5436 bytes
font_01_sfnt_off0000e74e.bin
5f8db6dda88be239473c3ffbda3352d241c976ea7c88cc372e5753af590218c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 10244 bytes

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