Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1176b71185ef03…

MALICIOUS

PDF

77.1 KB Created: 2021-03-24 07:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c69b53bec39daf568bc647c297c9c245 SHA-1: 18f9143fcae91c6e01f78c9bb39aefa1040d8bec SHA-256: 8e1176b71185ef03ebb26681960d7f97e99bb1bab8413d7972c1b52d05effc4e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based 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 0.9996

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://seumenha.ru/strik?utm_term=job+interview+questions+and+answers+sample PDF link annotation
    • https://sileperu.weebly.com/uploads/1/3/1/4/131406390/bojuvejasito.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/numerok_movaragimatoli_puvetikinivud.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/plant_high_school_football_playoff_schedule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_48c26ed5e78f4f028c70256784cd7a8f.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_54bbcdf99c54422eb9f4b1fc9859237e.pdf?index=trueIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_d60a4cf01e424a0da95f180f6f7faabb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/reporter_newsletter_ethiopia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6b0920-fd70-434d-9587-81521a4b92bd/video_games_to_play_with_friends_on_different_computers.pdfIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_674da5c8dc324770b31c42abd779d395.pdf?index=trueIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_614158d6c6d44464ad69f75cdea3a671.pdf?index=trueIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_223c113332a443128bfbcec6f7982b3c.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_dff3a33892ba4ebeb872d4f162a73408.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_182775b3d4184958b18942083d51feab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/denis.pdfIn PDF document text
    • http://kopolug.myartsonline.com/homedics_personal_portable_ultrasonic_cool_mist_humidifier_reviews.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_e9d7de899a7f4e9fa7c7cb674fdae57e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7259dd2c-8616-4eb6-82cf-823e18ccff07/89423646766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc769cd6-0757-4adf-8598-bb5c2fa2c565/wuxixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/312904a1-7417-4204-a6e9-75037baf1d34/how_fast_does_ssr_125_go.pdfIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/89366542985.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_4694a53a1ca0446d8b5532345b723ad0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokofapig/lexington_law_bbb_report.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_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 5512 bytes
SHA-256: 101968d9f9740c65836bcad6ccdc9cc08a878ad087e7acedf87c49b3771da402
font_01_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 10964 bytes
SHA-256: b2c1ce81649a929d11a0aec3e8f5f09d87e8e57b109578879eb499fc457d4280