Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b164aaf982a211…

MALICIOUS

PDF

75.3 KB Created: 2021-04-20 13:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 746f527ea79c8bdae7384690bfc72e4d SHA-1: 0a0eb71fd252b2acf06c74fb3e9620ad06d4b816 SHA-256: f2b164aaf982a2116fc0c4d91c023f0518cd9563868f982b1e64d8c2595ac95f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to redirect users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs, such as 'https://nipisod.ru/strik?utm_term=classical+guitarists+near+me' and 'https://cdn.sqhk.co/fagaxirupunu/NhjdjgV/crazy_taxi_online_emulator.pdf', are likely part of this malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=classical+guitarists+near+me
    • https://cdn.sqhk.co/fagaxirupunu/NhjdjgV/crazy_taxi_online_emulator.pdf
    • https://cdn.sqhk.co/nebafori/QHkiaij/pukatako.pdf
    • https://xatufatug.weebly.com/uploads/1/3/4/5/134597760/kojuvotibogezoru.pdf
    • https://xofezariro.weebly.com/uploads/1/3/1/8/131871505/2449471.pdf
    • https://bozajeja.weebly.com/uploads/1/3/6/0/136082115/fodatogawixudu.pdf
    • https://cdn-cms.f-static.net/uploads/4454184/normal_600dbf2ab94d2.pdf
    • https://static.s123-cdn-static.com/uploads/4366668/normal_5fe1a2c1ec114.pdf
    • https://static.s123-cdn-static.com/uploads/4393883/normal_60013465c3f08.pdf
    • https://cdn-cms.f-static.net/uploads/4370078/normal_602451f18fe46.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gozifep/278941315.pdf
    • https://s3.amazonaws.com/mekonulegipero/assassin_s_creed_unity_xbox_one_digital.pdf
    • https://uploads.strikinglycdn.com/files/2430d75f-f7a9-48c8-ad4f-7ef6c48f16b8/rituzugedizufulagejo.pdf
    • https://uploads.strikinglycdn.com/files/d3335051-102c-4615-b98d-c30c718cb23c/4275357099.pdf
    • https://uploads.strikinglycdn.com/files/6b84787c-0112-4a15-8221-a946d9954f0c/haier_5.0_cu_ft_chest_freezer.pdf
    • https://uploads.strikinglycdn.com/files/72599fd4-ea35-438a-b73b-003946072cba/30497327405.pdf
    • https://s3.amazonaws.com/dufekifaral/doxujak.pdf
    • https://uploads.strikinglycdn.com/files/ba55c681-d8bb-4a77-8e05-3da83c5fe0b6/how_to_think_positive_with_anxiety.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b5.bin
12022cd801289f2b2c20a7ee06c449df4307203b09b42834d4890aefe0d652a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 5024 bytes
font_01_sfnt_off0000f9b0.bin
ce3918ee207492f5bc421b2960d33727cb0e356bdb2fb02b3c2554fd605c3d06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 11284 bytes

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