Malicious PDF — malware analysis report

Static analysis result for SHA-256 27734c6e973b84ac…

MALICIOUS

PDF

63.2 KB Created: 2021-02-20 09:34:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: be4b2de0d0bba629829448c9b8e3bcd1 SHA-1: 39adb5d85d4fb859dbcc85f63fd9d107bc5c3d8d SHA-256: 27734c6e973b84acfa9d399d9344fe556278315b9fa2bed7a8a52c1a05b801bf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a large number of external links, suggesting a link farm or distribution mechanism for further payloads. While no scripts were explicitly extracted, the presence of numerous external URLs, including one pointing to 'jacksth.ru', strongly suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/aws?utm_term=how+to+clean+the+print+head+on+epson+wf+2750 PDF link annotation
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/b39f5f0bef.pdfIn PDF document text
    • https://cdn.sqhk.co/moxasapiwer/aLic2LU/bubble_spinner_game_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/3hbjbjh/scythe_digital_edition_rise_of_fenris.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/ugclp89/rulubosavawoterer.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/gf9hhif/nomijizawigusutixenovixot.pdfIn PDF document text
    • https://cdn.sqhk.co/fixefalid/wsijjey/beat_the_boss_2_unlimited_money_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zalopubid/ghgfjg2/armello_board_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/3idvAig/king_s_raid_plug_event.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/zpsEgjd/dslr_hd_camera_professional_4k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500447/normal_600a570a1b9f2.pdfIn PDF document text
    • https://cdn.sqhk.co/dilujuzaga/Bu3ahaM/pejufojulezototedo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500200/normal_5fe02d9b734ff.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/jaPfKhh/79764456869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_60107faadd624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472775/normal_600b64b63b55a.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/jagfXEu/23455388430.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC2 5776 bytes
SHA-256: 2db6d7383f9667ae731881c1f01324d6dab648f066adb835cb35c22fecc8066f
font_01_sfnt_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 9500 bytes
SHA-256: a86066b470779d00bee9fa0eef4557294230db8b713be32509842b5a621613d0

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