Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64cb87fd08dccd7…

MALICIOUS

PDF

79.3 KB Created: 2021-03-25 09:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0c5bcad421ab1a3a2fd80e1b55242af SHA-1: 7decba562cf28930993251fe8b10c379d0161d42 SHA-256: a64cb87fd08dccd79c83ec2a1e49b4e1fab047ceeb2b0ef14de867e99f53d7e6
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 pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The primary URL, https://jacksth.ru/strik?utm_term=how+to+study+organic+chemistry+in+one+day, is likely a lure to a malicious site. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=how+to+study+organic+chemistry+in+one+day
    • https://cdn.sqhk.co/ditutafewaw/ieDBtgg/new_calendar_2020_download.pdf
    • https://cdn.sqhk.co/dasewugiru/ohaiheV/dazosapow.pdf
    • https://cdn-cms.f-static.net/uploads/4495858/normal_60521b25c18dd.pdf
    • https://cdn.sqhk.co/mujawiru/jigeggm/14267508147.pdf
    • https://cdn.sqhk.co/busibelifiv/haL84gj/xulorawad.pdf
    • https://cdn.sqhk.co/zibusisujij/iaheahc/slimefest_2020_tickets.pdf
    • https://static.s123-cdn-static.com/uploads/4381302/normal_5fc8db0ce4411.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/92e7b2f8-26ed-41a2-a09e-f000cada9529/can_you_connect_monitor_hdmi_to_usb.pdf
    • https://uploads.strikinglycdn.com/files/aa32244e-6617-494d-bfe6-296a78a87aa2/4789883221.pdf
    • https://uploads.strikinglycdn.com/files/50d0c517-2b97-4997-8385-edacf222f678/pagezagavivepusexobale.pdf
    • https://s3.amazonaws.com/kesumasaka/vanaw.pdf
    • https://uploads.strikinglycdn.com/files/f6abea3c-fb90-4ebf-94eb-292cb1a9b19d/78702966685.pdf
    • https://s3.amazonaws.com/fixararololu/62607857456.pdf
    • https://s3.amazonaws.com/gavobawum/womowum.pdf
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_66189b2174f046f28129558128c613af.pdf?index=true
    • https://s3.amazonaws.com/takateg/84154282498.pdf
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_58f9f31e93aa4f49a13653e75512ab37.pdf?index=true
    • https://uploads.strikinglycdn.com/files/30dc054a-7260-436a-9713-48ec7e4eee83/water_resources_engineering_notes_download.pdf
    • https://uploads.strikinglycdn.com/files/75892cb7-1280-40e6-8c5a-8d93669fd7df/brother_sewing_machine_vx-1120_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/930718fd-d4f4-497a-a0db-d028103922ba/twilight_full_movie_free_download_480p.pdf
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_ad94e229f6254d3f848cba3881aa0e2e.pdf?index=true
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_a351a16c2b4142388365bfa7c1d0b717.pdf?index=true
    • https://s3.amazonaws.com/jexijer/pexavafimiromifozira.pdf
    • https://uploads.strikinglycdn.com/files/aa4dab7c-cd1c-4093-af2f-1d2ec04c387d/bersa_thunder_380_cc_pinky_extension.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_off0000f74f.bin
e81a1d66ea5c1be77ac6ee90225adf8bf573505f0cc08e1ceef5428fa399ff8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 5476 bytes
font_01_sfnt_off000109d4.bin
170b65ca8c04b8628a05321f635cc3e3bd0904cb627221d07fc65c14a9954f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 10972 bytes

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