Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9946c9eaee590c8…

MALICIOUS

PDF

77.1 KB Created: 2021-03-17 01:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 99745dbd456dcd9080387d026f1a1ab0 SHA-1: 3a245106c94ef1a25099f51f1cfff8b351e8aa7a SHA-256: a9946c9eaee590c8d8e73fd343a7d42559c1930031a423b7979ce6e61576242d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, 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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing/malware lure. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed 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://resalured.ru/strik?utm_term=spectrometric+identification+of+organic+compounds+pdf PDF link annotation
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/torimuzap-lasejese-gamolafanefu-judozijomojekax.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/hgkXOib/83820749292.pdfIn PDF document text
    • http://larediwavokib.iblogger.org/nezikogavux.pdfIn PDF document text
    • http://profmaster74.ru/mejeliwopotikufopoj7or8l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374699/normal_5feef162d16a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421365/normal_60024a766fb58.pdfIn PDF document text
    • http://rabota-plus.club/10163315442inst7.pdfIn PDF document text
    • https://lujegasot.weebly.com/uploads/1/3/0/9/130969173/3699101.pdfIn PDF document text
    • http://vwwv-avito.online/how_to_find_cash_flow_on_total_assetsfthu8.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/geE4ifs/weritetelolitaruwisuk.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/7hghe3U/fepoda.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/vidudow0bcvi.pdfIn PDF document text
    • https://jukudedavat.weebly.com/uploads/1/3/0/9/130969580/83d7c543670bb6.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/aiag_apqp_formatshd4zs.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/gheEggr/welch_s_pb_j_sandwich_nutrition.pdfIn PDF document text
    • https://vusuvorolom.weebly.com/uploads/1/3/4/5/134501440/4362694.pdfIn PDF document text
    • http://volomowoxe.22web.org/86352789266.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolunivagoxel.epizy.com/candidiasis_genital_tratamiento.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_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 5544 bytes
SHA-256: 045975f8e6c142d14245d2f7e172f2e56fde4070095b2b014e884c5db96b699a
font_01_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 10104 bytes
SHA-256: 552194dcb9b7f10df4df5735657f8c50d429213e433b7f256d0467c88dd78d7a

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