Malicious PDF — malware analysis report

Static analysis result for SHA-256 955d9c2f533e7b6e…

MALICIOUS

PDF

73.2 KB Created: 2021-03-01 02:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cb101cf9a0bc8d06221d1148b71b5c36 SHA-1: edc7c8073ff50f8ea5d68156fdc4326595384842 SHA-256: 955d9c2f533e7b6e04e15cfeb7bd0d18ce950e35ce2c993aa4caa576d879dd2a
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 'resalured.ru', suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting 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://resalured.ru/strik?utm_term=where+can+i+buy+twilight+midnight+sun+movie PDF link annotation
    • http://xuridikak.22web.org/vusamikevafod.pdfIn PDF document text
    • http://homiak.fun/aquasource_faucet_valveq2oph.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/iiGJggi/tugatenujisem.pdfIn PDF document text
    • https://cdn.sqhk.co/powurejur/hgifjcA/30670635043.pdfIn PDF document text
    • http://opt05.ru/user_guide_for_iphone_8l10mh.pdfIn PDF document text
    • http://devovonabukuzim.66ghz.com/avchd_file_format_for_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/xijjfic/vosawikumoduz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_5fdbab306c91b.pdfIn PDF document text
    • http://rating-bookmaker.ru/guvubarinesodumasoroh3n04.pdfIn PDF document text
    • http://1gusevshop.space/pedetuvokiporizejopa2uh4l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwozonez.epizy.com/95763040510.pdfIn PDF document text
    • http://guzumirofega.epizy.com/printable_t_shirt_template_red.pdfIn PDF document text
    • http://rugokabiko.epizy.com/luzadowazorufetejexonup.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/windows_10_activator_kmspico_free.pdfIn PDF document text
    • http://tuwixinunisak.epizy.com/23154564090.pdfIn PDF document text
    • http://sonisan.epizy.com/treasurer_s_report_for_church_agm.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_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 5760 bytes
SHA-256: 8557a1b8de4c3a38bb980429c3684910e33858728d8d5f3167333453af0a5857
font_01_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 10080 bytes
SHA-256: 325b67aaf8855a29e85574042b673778b9baf9b7f7cd3ba021ee19eef5467d64

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