Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c847b654619f01a…

MALICIOUS

PDF

84.1 KB Created: 2021-01-25 20:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: fe0f9d8f21f3f8137c2d7722a783d2be SHA-1: b942466f4fba16ce8695e9401f27548da1082c27 SHA-256: 8c847b654619f01a2a5d4dbb021877f4ac5cf62a3f0ae6539c0472c769aa6a1c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, reinforcing the malicious intent.

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://baarspo.ru/123?utm_term=spy+school+goes+south+ending PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fe06b7216a2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_5fd27e048c099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425487/normal_5fe3c731d5d31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373985/normal_6006edb9cad1e.pdfIn PDF document text
    • http://bandalet.club/spider_man_running_games_online_freewihpn.pdfIn PDF document text
    • https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/wowov.pdfIn PDF document text
    • https://xifisipur.weebly.com/uploads/1/3/1/0/131069870/9874085.pdfIn PDF document text
    • http://grinallex.shop/wofefegoglmbx.pdfIn PDF document text
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/buzivonamub-rifogov-waxusaf-bubavuk.pdfIn PDF document text
    • http://organicnu.info/biggest_artillery_shell_ww19pzqt.pdfIn PDF document text
    • http://sreview.online/13565086732tmyro.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/tasufagijaremo/werase.pdfIn PDF document text
    • http://savefativiluz.epizy.com/hirayama_autoclave_ha-_300p_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/vipitof.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/77562855834.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_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 5236 bytes
SHA-256: ac80a28ffea720f7b3cf03cf397dfe14c23250e42ff585935119ffcab4c97a96
font_01_sfnt_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 11264 bytes
SHA-256: 60888bf6090e64e1f408d3b744a062b75e970e24defb1e43744b53ec5f71453b

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