Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c03fa6497064710…

MALICIOUS

PDF

75.5 KB Created: 2021-03-19 19:31:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9df76f024dc275ef94c64f5170cbd554 SHA-1: 749117df11dc2cf27aef080f4c3e3b5fb4307964 SHA-256: 7c03fa64970647101b2784502ffadb5bb923f6e2071259ee4bde80860bece4ad
176 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kuzutuzo.ru/wix?keyword=fluid+mechanics+fundamentals+and+applications+2nd+edition+solution+manual+pdf PDF link annotation
    • http://bulibujirifubof.scienceontheweb.net/hernia_de_disco_intervertebral.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvapolaxaj/hhrgjjh/3852318188.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/dungeons_and_dragons_core_rulebook_gift_set.pdfIn PDF document text
    • https://pelunukemuf.weebly.com/uploads/1/3/0/7/130776607/edec719c0f93.pdfIn PDF document text
    • http://dulisakip.medianewsonline.com/towap.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/iigfL0n/wokivaxosaxanokesikadef.pdfIn PDF document text
    • http://raftgjgr.space/attu_movie_song_in_starmusiqrb7tr.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/jDifhj5/gowufanakesug.pdfIn PDF document text
    • https://loligilifalo.weebly.com/uploads/1/3/0/7/130775627/muzuvigevat-wugenivuwawek-zesalidilo.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/08000585cff275a.pdfIn PDF document text
    • https://lemamoramu.weebly.com/uploads/1/3/5/3/135348447/fapujujenevisisog.pdfIn PDF document text
    • http://gratoraama.website/anydesk_control_androidwb6uw.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/PjhZwje/zifideburapivajajowax.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://s3.amazonaws.com/jolozidabi/promoting_health_a_practical_guide_6th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/network_security_engineer_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/android_alarmmanager_onreceive_not_called.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6884698e-4513-4558-8978-cacdb9bf719a/kewanun.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/income_support_calgary_reporting_card_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fdea55-592a-477d-9f33-23b18181665c/73369359086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04eb385-7271-45b8-bed2-338911cbbf43/how_much_is_ps4_slim_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b2e194-9513-4353-8ca3-89e09b51868e/pokemon_sun_and_moon_expansion_card_list.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/7679830257.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 5268 bytes
SHA-256: 6898a57516629a6b93bc0b72461bb39de94402a81fe061c4a438f3477732acd7
font_01_sfnt_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 11852 bytes
SHA-256: 35f8a4ee2469cf2a51641dcd65ed0a1361292e83087b6d6ad96e20f959ac11da
font_02_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3