Malicious PDF — malware analysis report

Static analysis result for SHA-256 8453a7f0dcd8a85b…

MALICIOUS

PDF

168.4 KB Created: 2021-03-14 00:19:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d2585f60a52b0777743812092f3138f1 SHA-1: 5fb842c67fc2bde038dc3e7ff078c3c10bd36cc1 SHA-256: 8453a7f0dcd8a85bd40d55cd010a3beaf3f26f8febddb6747d25ffe7b1d9eccc
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one pointing to `jacksth.ru`, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=1776+musical+script+pdf PDF link annotation
    • http://depalowivejal.iblogger.org/85422454573.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/world_map_blank_outline.pdfIn PDF document text
    • http://whysmall.space/93919822176silsu.pdfIn PDF document text
    • https://sejesomizibiji.weebly.com/uploads/1/3/5/3/135346687/926d6420.pdfIn PDF document text
    • http://helpverifybadges.com/does_my_tv_have_optical_audio86fup.pdfIn PDF document text
    • https://puzagetidorijes.weebly.com/uploads/1/3/4/4/134495880/7084498.pdfIn PDF document text
    • http://palitra-cveta.ru/sofijusivagfdfe0.pdfIn PDF document text
    • https://lujovimujesami.weebly.com/uploads/1/3/4/0/134019161/654d9ab36d019.pdfIn PDF document text
    • http://laserisesiseno.getenjoyment.net/rozunaxakumeku.pdfIn PDF document text
    • http://wiinorama.space/lekaganawitut0u7z.pdfIn PDF document text
    • https://jezexubuxerib.weebly.com/uploads/1/3/4/0/134040893/aac43fbd013cdfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigemubirovivo.epizy.com/wepufuzeralu.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/pexafirutagemumewopumemor.pdfIn PDF document text
    • http://tuxavilewik.rf.gd/how_do_i_fix_conditional_call_forwarding_active.pdfIn PDF document text
    • http://novizem.rf.gd/20253659707.pdfIn PDF document text
    • http://wotawegij.rf.gd/how_to_use_wagner_fence_spray_gun.pdfIn PDF document text
    • http://pasudef.rf.gd/fewavosirorogonus.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/34258377270.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/vifomizegelaloxedenufizup.pdfIn 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_off00025b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B15 5492 bytes
SHA-256: a20f684778702d8a8f6a1ef05b1d28bd07b0935f8b0d10bd98135d16eec2a303
font_01_sfnt_off00026db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26DB3 11256 bytes
SHA-256: 5c8cd45e45c89a69715718759165c6ecaa0d8d99ad5e528b406a8c372d45fb87

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