Malicious PDF — malware analysis report

Static analysis result for SHA-256 608971732604d616…

MALICIOUS

PDF

84.1 KB Created: 2021-03-17 13:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6154e5500e3653899f3db910ae8c9221 SHA-1: f7fee874244704d46f1e9b51c212be54d09510f0 SHA-256: 608971732604d61654bb4512d09befaf0cb5d07429c8ea006ede1fec34bac34b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://resalured.ru/strik?utm_term=are+ion+record+players+good. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=are+ion+record+players+good PDF link annotation
    • https://cdn.sqhk.co/tategupet/hYkjhje/63746099993.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/TuRXhgf/aranesp_prescribing_information.pdfIn PDF document text
    • http://ukrdomonis.xyz/15660470039hsbtf.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/wPAhgNd/that_song_you_do.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/jhiehbq/taxafixerimusad.pdfIn PDF document text
    • https://vobikonim.weebly.com/uploads/1/3/5/3/135390296/2162215.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/c6igibt/bakironobukosinorakafuke.pdfIn PDF document text
    • http://kamaz-ftc.com/hungry_shark_evolution_all_sharks_unlocked_apk51qmr.pdfIn PDF document text
    • http://ru-en.xyz/sandisk_16gb_clip_sport_plus_mp3_player_manualbql9a.pdfIn PDF document text
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/lexozi_fexudero.pdfIn PDF document text
    • https://cdn.sqhk.co/duzupafuj/eAhgrjc/wewiposepi.pdfIn PDF document text
    • https://bejobofilu.weebly.com/uploads/1/3/0/8/130814531/ripurufi.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/ib7yDh4/21647638119.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/YjjfhbF/madakutivikak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_cd67400c5abd4962a69fd37b8b5ae879.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_d01db251e2bf40b89c5814ddab295f0a.pdf?index=trueIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_534dd6ed2c4c48dd885edb54bcdd7112.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_9b393378d2ee437fab505d5c382a4691.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_09a29bc671394312abfc4340f1a96c13.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_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 5332 bytes
SHA-256: e61170f30dde1035a4a9e0917a8cb012db9ac150ac4daf63f028652277950484
font_01_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 11068 bytes
SHA-256: e54f0beed39fc3dd59d2c2e99e4704c57d03163f7c0426519962716471face2c

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