Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7f9f4b88edafe1…

MALICIOUS

PDF

67.6 KB Created: 2021-04-19 07:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f2c17d1888b9c2d4c3b33ebb26bc017d SHA-1: 1038f8bd5f4d9a3af912fab1cd4412420b00b66b SHA-256: aa7f9f4b88edafe16c27e0fe3b2fa53d06374ef5b629c4aec22fc8f707a8525b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic further support this, indicating the PDF's primary function is to redirect users to external 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://baarspo.ru/strik?utm_term=it+project+manager+jobs+seattle PDF link annotation
    • http://dojoposurubim.22web.org/13431622671.pdfIn PDF document text
    • http://shoop-fm.ru/dopelewaniruxaworqdjkq.pdfIn PDF document text
    • https://jofexudu.weebly.com/uploads/1/3/5/2/135295173/1374261.pdfIn PDF document text
    • https://cdn.sqhk.co/ralofobo/gcZe4h1/32424423998.pdfIn PDF document text
    • http://kleomaften.online/how_to_use_dell_premium_active_penjode2.pdfIn PDF document text
    • https://xijexarara.weebly.com/uploads/1/3/4/0/134017378/dae936bd.pdfIn PDF document text
    • http://pabitej.22web.org/digital_marketing_jobs_in_bangalore_for_freshers.pdfIn PDF document text
    • https://mazazujusuvazix.weebly.com/uploads/1/3/1/8/131856432/74025.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/7162673.pdfIn PDF document text
    • http://takodevizol.iblogger.org/gaxuzizemixunogugani.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496404/normal_5fe27b055d17e.pdfIn PDF document text
    • https://remoruputudedux.weebly.com/uploads/1/3/4/0/134017090/5788112.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/elTooia/download_football_manager_classic_2015_android.pdfIn PDF document text
    • http://hyipinvest.site/what_is_included_in_a_ministers_housing_allowance1os07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386620/normal_604990256976e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_68d3b46092c64cbbbdadfbb04c16d30a.pdf?index=trueIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_8d341f6cea114304b29ece94f5dd5295.pdf?index=trueIn 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_off0000c8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FD 5408 bytes
SHA-256: 74d9a26b43ff43c9dd2a56760fa0234692ad16686776cc838de31f31d17f5dad
font_01_sfnt_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 11264 bytes
SHA-256: 98179e568de9f094b498bc939e81c23fc24692d1063bd5ef85b79efb709faca9

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