Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4994007555fd37e…

MALICIOUS

PDF

74.9 KB Created: 2021-03-22 18:06:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c0c90cf3e3680a65a02cae0aa527431 SHA-1: d554e5f62d407ccb5a66449c739638acfcef1480 SHA-256: f4994007555fd37e1357a579f0f3305cdb711dd408221c075b6f4908134bb829
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL being `https://pelibifir.ru/123?utm_term=appeal+parking+fine+letter+template`. ClamAV detected this as `Pdf.Phishing.Trojan`, and ML classification strongly supports maliciousness. The document body, though heavily obfuscated, suggests a lure related to parking fines, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=appeal+parking+fine+letter+template
    • https://cdn-cms.f-static.net/uploads/4487631/normal_603e5d5fadf1e.pdf
    • http://carinsusa.com/how_to_wash_sunbeam_heating_blanketq4ikf.pdf
    • http://ulekschool.online/kojigorefcvn0h.pdf
    • https://degexaxi.weebly.com/uploads/1/3/1/4/131406510/xomijelosagam.pdf
    • https://static.s123-cdn-static.com/uploads/4413838/normal_5fca69e7b6330.pdf
    • https://kagodititaf.weebly.com/uploads/1/3/4/8/134868324/2623869.pdf
    • http://hdvideo.design/zovobikipuwurejewekurasijnbkzv.pdf
    • https://dibetoxiruvon.weebly.com/uploads/1/3/5/4/135400859/finafowo.pdf
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5fdc860dc75fd.pdf
    • https://cdn-cms.f-static.net/uploads/4466379/normal_6015ad85a61ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/aa59aa6d-998b-4ea9-95de-ad8f9a8ac7ac/itil_v3_foundation_certification_badge.pdf
    • https://uploads.strikinglycdn.com/files/2e18225a-bfa5-45f3-9d19-636ddf6dc3de/xawita.pdf
    • https://uploads.strikinglycdn.com/files/25b27c22-dcf0-43bc-b508-3589c7615342/how_to_calibrate_oven_thermostat.pdf
    • https://uploads.strikinglycdn.com/files/18f16c75-7ca0-4046-8f4e-e80621a4585f/how_much_does_it_cost_to_replace_a_motherboard_on_a_hp_laptop.pdf
    • https://s3.amazonaws.com/paropabaru/valentines_day_letter_to_my_sister.pdf
    • https://uploads.strikinglycdn.com/files/ecdd6de2-f1e4-4b49-be2e-c3117553fb50/wodurotigadipunaxaweziwe.pdf
    • https://uploads.strikinglycdn.com/files/9caaec81-ac60-4746-9f1c-bfe93313a777/74174570660.pdf
    • https://s3.amazonaws.com/jizubisetebof/timojonita.pdf
    • https://s3.amazonaws.com/sasufufa/yeezy_boost_350_v2_sizing_guide.pdf
    • https://uploads.strikinglycdn.com/files/886964ec-f78a-4335-838a-a3c8c867edc0/free_printable_intermediate_christmas_piano_sheet_music.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_off0000ea91.bin
95ed3c464dfbf353b5c4a25c9554c41935e594f8fa28db4d3c4eb18176e350a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 5096 bytes
font_01_sfnt_off0000fbd9.bin
7622a167f8cd2cde85aea8a5858e3f836e8721e1f21a8fdf2694f4f6f404aaf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 10212 bytes

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