Malicious PDF — malware analysis report

Static analysis result for SHA-256 551cda00c32dcd13…

MALICIOUS

PDF

70.0 KB Created: 2021-02-26 14:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d8b0d1ffb0e07793b13bb431ebd2e085 SHA-1: a16d3d2604da7c1d2eaed311532ad53160099476 SHA-256: 551cda00c32dcd1304398682415cec577065ecdd3b552ce78ed221314e631e95
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URIs, many pointing to disposable domains and configured as link farms, strongly suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=toyota+rav4+hybrid+problems+2020 PDF link annotation
    • http://agnewjacobs.com/craft_legendary_wown7y4k.pdfIn PDF document text
    • http://natezaka.iblogger.org/6.0_powerstroke_turbo_install_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/kovajivika/higtHjb/my_android_won_t_charge_to_100.pdfIn PDF document text
    • http://nowatora.22web.org/7766652794.pdfIn PDF document text
    • https://cdn.sqhk.co/toledexipez/fsJgehf/7300511437.pdfIn PDF document text
    • http://waxawazurutane.22web.org/nubufejuki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lenixad.epizy.com/6094269902.pdfIn PDF document text
    • http://lomuripejo.epizy.com/jipumavavigavaditaraxax.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/ranominenavubeteme.pdfIn PDF document text
    • http://ruludamena.epizy.com/aoe_1_full_bn_chun.pdfIn PDF document text
    • http://laxunuwozen.epizy.com/general_science_reviewer_with_answers.pdfIn PDF document text
    • http://nanomunem.epizy.com/50854129317.pdfIn PDF document text
    • http://tuvatopuvonu.epizy.com/2972710808.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_off0000d4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A6 5812 bytes
SHA-256: 5870080791c62a4ae73db5ce18bb6159a5d9553ccfa614cd47e305956f23b07b
font_01_sfnt_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 10604 bytes
SHA-256: 06920d2ac54dfb26924ec2d85817fd98283650142662e1c7cd100c90ac496cac

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