Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc628ab0918acab7…

MALICIOUS

PDF

72.8 KB Created: 2021-04-15 06:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0825431bbd5cbeeb3001f2672db6bdcb SHA-1: 2fd8a2a06710c816fb3a1564c3960a98a61e4453 SHA-256: dc628ab0918acab7dd9242863b30d479215544f7a56449082afb3345bff58c25
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 disguised as legitimate documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs point to domains that are part of this link farm, suggesting a coordinated effort to redirect users to potentially harmful content.

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://pelibifir.ru/strik?utm_term=how+to+replace+lid+lock+on+maytag+washer
    • https://cdn.sqhk.co/gizivapejoko/mihC7hf/best_cooling_sheets_2018_uk.pdf
    • http://finipupote.mywebcommunity.org/xidafobe.pdf
    • http://zudepogumo.medianewsonline.com/zufirabibilepav.pdf
    • https://cdn.sqhk.co/jidulopavoji/AidTgdl/mein_globus_kundenkarte_gutscheines.pdf
    • http://springtea.space/lifesaving_society_emergency_first_aid_test_sheet4vjn1.pdf
    • https://vomalokigalexa.weebly.com/uploads/1/3/4/3/134329787/tidepupererilif.pdf
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/fozejago.pdf
    • http://sokegex.mywebcommunity.org/around_the_world_in_80_days.pdf
    • http://cardio-natural.info/descargar_pelicula_la_cenicienta_disney1ub87.pdf
    • https://cdn.sqhk.co/wosuzumamig/ghidxW8/13841393126.pdf
    • https://mikutefax.weebly.com/uploads/1/3/4/8/134866710/fenani.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pabewuvuxaf.onlinewebshop.net/how_to_assess_listening_skills.pdf
    • https://s3.amazonaws.com/vixuwogetiv/resize_bitmap_in_android.pdf
    • https://s3.amazonaws.com/lusegokaves/gmail_manual_settings_for_outlook_2010.pdf
    • https://s3.amazonaws.com/zedudo/rosisokidaxarevo.pdf
    • http://gemawinikifiv.myartsonline.com/homero_iliada.pdf
    • http://bamonoxo.onlinewebshop.net/fetekububagapovuwibama.pdf
    • https://s3.amazonaws.com/farefasejikap/14613664314.pdf
    • https://s3.amazonaws.com/xakusineba/acromegaly_consensus_group_guidelines.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_off0000de9b.bin
d8619bc8aabb94c2409feffd20c7315829e6565e15b6f299982e5437e40484d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 5704 bytes
font_01_sfnt_off0000f1f6.bin
4567cc9fd5e4ad0221dc21ae5ba12d16328bd695c0116ff8b2acbc7384a1ccd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 10344 bytes

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