Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b819d1748f0e47…

MALICIOUS

PDF

86.9 KB Created: 2021-03-20 19:34:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f1751b56bbba89b73a0f022f979c080 SHA-1: 78450f7dc44e6387e7b89bc569fff28b734a2b2b SHA-256: f1b819d1748f0e47ce031e29dfcfc267f25f6c180c1971dfe02415f7e83594ed
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files hosted on various platforms, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=tamil+actor+vijay+sarkar+photos
    • http://amorexpo.com/71572350789xp6qe.pdf
    • https://cdn.sqhk.co/muwunupudi/ljjjaii/pulixoxemimenu.pdf
    • http://pokemonrivals.online/what_can_you_eat_on_shred_10thip0.pdf
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/rixikeg_dotupome_fujorubowafes.pdf
    • https://cdn.sqhk.co/pebekaja/JNwIKjd/fuvikagewufafonogi.pdf
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/pafatadawawalagof.pdf
    • https://cdn.sqhk.co/vumusokutil/KJbCidj/microsoft_sharepoint_designer_2010_64-_bit.pdf
    • http://netewe9.xyz/acer_15_cb3_532_c47c_15.6_chromebook3maot.pdf
    • https://cdn.sqhk.co/vubiwete/iagihcO/granny_square_blanket_instructions.pdf
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/xejosijasege.pdf
    • https://cdn.sqhk.co/jawuraxexije/7Zjjjj4/kigopizego.pdf
    • https://static.s123-cdn-static.com/uploads/4496380/normal_60031995bc576.pdf
    • https://cdn.sqhk.co/dirotiweze/ja7geje/fidosoduwebutomelevozi.pdf
    • https://cdn.sqhk.co/nepajenine/iaiicjf/thronebreaker_walkthrough_rivia.pdf
    • https://zolezuborejizo.weebly.com/uploads/1/3/4/4/134444688/doxilozural.pdf
    • https://static.s123-cdn-static.com/uploads/4452385/normal_5fe20a4d61811.pdf
    • https://cdn.sqhk.co/woteruzid/cshfhcH/the_richest_ice_hockey_player.pdf
    • https://raxitiladiruwek.weebly.com/uploads/1/3/4/4/134487911/gowopujaxuzesizow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/08d0021d-70ef-4d32-ae0b-5814c33e2ad4/78875684693.pdf
    • https://uploads.strikinglycdn.com/files/611c84c0-baf1-47bc-9538-886054c518cc/2017_ford_mustang_gt350_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/a45fc9c4-c0d3-4d0a-8294-3be6410a228d/wheres_waldo_mystery_character.pdf
    • https://uploads.strikinglycdn.com/files/46d6926c-8a7e-4774-88f9-27ebe4c48087/what_is_norse_mythology_equivalent_of_the_apocalypse.pdf
    • https://uploads.strikinglycdn.com/files/68dae4d2-d787-4a64-8977-77a4ef7d80fa/ipibl-lb_motherboard_cpu_support.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c8.bin
f89be45175bef9c86d9d60b98a9de6bcac33529c6e50d9cd33b62e22df317136		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 4988 bytes
font_01_sfnt_off000102c9.bin
8d7463d8cc899338848aebda16f72f8ef5448fb65590e0690827e7110ca5aff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 11092 bytes
font_02_sfnt_off000128db.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128DB 16164 bytes
font_03_sfnt_off00013df4.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF4 4324 bytes

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