Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e85c7c57c1cbc73…

MALICIOUS

PDF

93.6 KB Created: 2021-03-18 07:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3ad901ea6ed2f90f2d70812c2044fc33 SHA-1: fff9c79d9b39b94567886ad6cfe177789ed5b65e SHA-256: 4e85c7c57c1cbc73abc95851ddbf2dcfac91f4ecc1a979afaff465b9ff89e048
206 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 0.9991

Heuristics 7

  • 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 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.
  • 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://baarspo.ru/strik?utm_term=what+is+the+displacement+%25CE%25B4x%25CE%25B4xdeltax+of+the+particle PDF link annotation
    • http://jebifawulu.mywebcommunity.org/ielts_writing_task_2_model_answers.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/fadijesanusut.pdfIn PDF document text
    • https://tewagolefavir.weebly.com/uploads/1/3/0/8/130814187/6294502.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/zitoxuwunalele.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/how_to_make_a_thermal_imaging_camera.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/9555349.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1a8f09-24d3-4766-b1de-a74bc4dafa7a/newonobofax.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_67c42eff03444a3fa8a630d6ef6bbe5b.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_2bb3e5768c754b8083eb28fc8be44e9e.pdf?index=trueIn PDF document text
    • http://wazeniwemir.onlinewebshop.net/2303333982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025f6ce2-157b-4a96-b496-0ab591d58503/67156921880.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_aa17ac0405b042cf9138d93b5c9b5676.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_b21813b3be4a4289b12518b91e8b336f.pdf?index=trueIn PDF document text
    • http://penanaras.myartsonline.com/what_does_it_mean_if_a_horse_is_broke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691d419c-2f25-41c9-b804-4c046f7bcf0b/68488863166.pdfIn PDF document text
    • http://dupepoge.onlinewebshop.net/sas_ods_excel_output_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a05918-fc46-4f4b-bcad-5fe352f3cb0e/minn_kota_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22fb7617-b669-4655-9c6e-e36bc6ed9d0e/gadoxedaguxetijurawanixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28baa3c6-4440-47dc-9309-2db83256c6da/61125971776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40fb8bd2-cff6-48b3-89fd-e41a8d5ed7d2/dell_inspiron_5720_drivers_windows_7_32_bit.pdfIn PDF document text
    • http://xowilewegiwo.myartsonline.com/how_to_fix_a_seized_outboard_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2bcb7f4-77a4-4e3d-a401-42f3bfadc018/73406251842.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_570c000fe7be4ad5988dbac7f465d438.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1743ad27-a10e-4cfb-9b77-bbda53017fe5/what_comes_after_7_3_8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE6 5612 bytes
SHA-256: 71342d5e3697bd04406ca857c22fe5fa0ba6e15c68a486e545853d1f401c8710
font_01_sfnt_off00013fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEF 11108 bytes
SHA-256: 1c9b06aefeef7fb713da125a30090d87c94f9e03331d179e6a03daf61fa03896