Malicious PDF — malware analysis report

Static analysis result for SHA-256 e108faea6eca70b5…

MALICIOUS

PDF

75.6 KB Created: 2021-03-23 03:36:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb2f8e511b0572373a9e71ad987bb3d5 SHA-1: d4400743d3080099f2823fac974d9a64814e7e5c SHA-256: e108faea6eca70b574979a76543a2a2a05bce4af06c8cfe8cae70dc8487ec0cd
206 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'SE_CALLBACK_LURE' suggest the document is designed to trick users into interacting with malicious content or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/award?keyword=pediatric+advanced+life+support+pdf+free
    • http://sugameloxufe.mywebcommunity.org/all_of_me_john_legend_piano_sheet_music.pdf
    • http://vexasefagi.scienceontheweb.net/mapimusanoda.pdf
    • http://beritox.medianewsonline.com/84106464425.pdf
    • http://vujenixuwo.mypressonline.com/conductivity_of_copper.pdf
    • http://degimogug.mypressonline.com/how_to_fix_a_water_softener_leak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_c46075632a4f42439ead21a935964565.pdf?index=true
    • https://2b075577-062e-477b-ba44-a680027dca12.filesusr.com/ugd/ee943f_0ea6dc06ab37454db7a79a5f02b9b3ba.pdf?index=true
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_07359027965d4fe18e07acdfb61d0a89.pdf?index=true
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_fcebbedfcf894b84b0b6aed2c0685511.pdf?index=true
    • https://fefcf4f0-bf52-4086-adb3-b788df03f7bd.filesusr.com/ugd/da9d4c_91d2b208eaa6415fa0627207c52e9ad3.pdf?index=true
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_a70053878b6c47bfa2f352dba28249eb.pdf?index=true
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_28c76425320c46879c6fb6dd819d75c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/213af66a-cb5b-4447-978d-3ffb262e16fd/5453345311.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_40d2e5520e154d07ab48d983e8b471d8.pdf?index=true
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_9d05dd97b73c49b9a04949ab5b913297.pdf?index=true
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_13fbc1a6579e456288a57a155282e259.pdf?index=true
    • http://vidilig.onlinewebshop.net/proposal_skripsi_akuntansi_perpajakan.pdf
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_799c2aa75bea4ccc8e2ab2e6b5820872.pdf?index=true
    • http://xedawobu.atwebpages.com/packliste_backpacking_thailand.pdf
    • http://mepitar.atwebpages.com/rotufugobojarejovobujowut.pdf
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_acbafd468e974344aed79edf6c8cb969.pdf?index=true
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_a9863cc89eda4b549a9197a158cdae8f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/456fd95a-802c-4fdd-8a9b-58f5984c7676/49157026993.pdf
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_e155a126c35b43dfacf27b4a3d93e0cd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/260d8b6f-de15-44aa-927c-efced36fd905/zopigezatazom.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_off0000e6b7.bin
9259149b38ed6344692dd5488d09d8fd0d10f77e00c6fec9eabfce3d22ab11c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 5208 bytes
font_01_sfnt_off0000f888.bin
19f85fb212db59b5e245c147ecd8301d64e6b6b960bb76b566b3c7d55d974873		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 11256 bytes

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