Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d5ec515598948e…

MALICIOUS

PDF

59.9 KB Created: 2021-02-11 12:32:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0415b9382dedb2e30d071d9ac8e485e5 SHA-1: e28e3941ad5a6a21ae47501e2858052a9d78b31f SHA-256: 53d5ec515598948ee5b8a8c129c30f142c49ee6fb3da1e3d53d965d0eb3a91cc
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One URL, https://jacksth.ru/123?utm_term=space+saver+microwave+with+vent, is directly embedded and appears to be a lure. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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/123?utm_term=space+saver+microwave+with+vent PDF link annotation
    • https://mamudige.weebly.com/uploads/1/3/0/8/130874639/jinadexud.pdfIn PDF document text
    • http://arendagg.xyz/legendary_game_of_heroes_f2p_guide7r8e7.pdfIn PDF document text
    • https://giponijas.weebly.com/uploads/1/3/1/4/131453823/c92fed266d.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/jfR2hg8/market_garden_ww2.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/mexuman-besajuk-widerojusaser.pdfIn PDF document text
    • http://wacc-cat.org/zisojitisukazatozidezisncg6a.pdfIn PDF document text
    • https://zuwasaroniw.weebly.com/uploads/1/3/1/3/131380739/lujotinufitefamoko.pdfIn PDF document text
    • http://899themes-demo.ru/54701315347rujpa.pdfIn PDF document text
    • http://unonatur.space/marokarolebe15adz.pdfIn PDF document text
    • https://nadarikiwuxat.weebly.com/uploads/1/3/2/7/132712530/banefaviwaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/numunenoji/world_inequality_report_2018_india.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/zibob.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/31243919119.pdfIn PDF document text
    • http://dorizoki.rf.gd/abacus_alarm_installation_manual.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_off0000ae98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE98 5396 bytes
SHA-256: 5b58f490d931464f5e21f6286d53504a1f6ef3dd0802f45a3dca2eea0f5dc0e0
font_01_sfnt_off0000c0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DE 9448 bytes
SHA-256: d36f27387236a40b1c107150da9d6dbd8cd2e6f480082d84c185db5d25aa8824

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