Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9b08eefaf41406…

MALICIOUS

PDF

91.0 KB Created: 2021-04-11 08:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4c6310eaa7e98068d6515638732b1254 SHA-1: 79d15a0f99687026938c0e9f56c55bfa734f42aa SHA-256: 1f9b08eefaf41406d99d387230d2a19a111345e52f91012ac2a459b8a5de163e
146 Risk Score

Malware Insights

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

The PDF contains malformed streams and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware delivery document. The embedded URLs point to disposable domains, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jottigo.ru/strik?utm_term=define+literal+rule+of+interpretation PDF link annotation
    • http://giocodigital.website/a_twist_of_the_wrist_1iyr0i.pdfIn PDF document text
    • http://hytri.com/gukevarijogukqkwm.pdfIn PDF document text
    • http://idealslimitaly.site/datosv5iyi.pdfIn PDF document text
    • http://tixshopclub.space/fimosabaroezscc.pdfIn PDF document text
    • http://hihikane.space/kalburgi_news_reportwgcby.pdfIn PDF document text
    • http://andyhongdigital.com/rolikazogodojiwogkgoe.pdfIn PDF document text
    • http://premiumpornclips.com/gibson_gforce_tuner_batteryuzwe4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_892b286199094478ac1f9608d538f1b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5c28a2-f05c-4d36-8ce5-d9d66ea1c21e/pokemon_mystery_dungeon_red_rescue_team_release_date.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_a829a5c835e044ceb7e199c9cdb02f1b.pdf?index=trueIn PDF document text
    • http://kobinegugagikag.epizy.com/practical_english_usage_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f55d90-40ac-4f5a-9db7-a3dfc5eb38e6/nedebotorula.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_0b954c7988274629a30d02a9c142cea9.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_00807a50239e4041b8d5d0e9d4c87aee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5466e5ea-c087-4a46-be84-a8dee61769ec/89860524521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebf4038-d640-4537-93f2-06a543c41176/what_is_the_best_stihl_chainsaw_chain.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_61c887a461c4458e8b7af42cf8f1a2b1.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_292eacdaedc14e469623f9b1c6c3716c.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_e4bd6b2d1d254520b1d3f3e5ec7609f4.pdf?index=trueIn PDF document text
    • http://forolulazo.rf.gd/job_stress_questionnaire.pdfIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_5a23021e53f14cca8a439b4dfd746af1.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_09301e9a39df4f8eb197a5d7e5889a65.pdf?index=trueIn PDF document text
    • http://megutid.epizy.com/oracle_database_sql_tuning_guide_12.2.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 4600 bytes
SHA-256: f2537ccde407b9df91b213b5fb83ff6ca7d34969dfe74825ef3510f8d013cc04
font_01_sfnt_off00010e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 12064 bytes
SHA-256: 590d4cbeb811aaaf92481a1969ec13ea96a9eb22767d33482bb0b4a45c9db1d7
font_02_sfnt_off000137e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E9 16416 bytes
SHA-256: 787b5bcc7da894ef01415d960e8b46fe90996b5cd95885f71f9175ff606b8ab4
font_03_sfnt_off00014da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA4 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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