Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c7647633d6c48e…

MALICIOUS

PDF

98.6 KB Created: 2021-04-15 12:40:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 907b1bdc73628be0f56b66b7e2779aa8 SHA-1: 9b414828df33780e47dc068c17124919d10cbccd SHA-256: d8c7647633d6c48ee7b19af75f674bfaf8d7fa5d02740c8669ecbb15e6a90d47
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=washington+gas+company+woodbridge+va PDF link annotation
    • https://cdn.sqhk.co/murafabu/iafiQmi/simulacra_pipe_dreams_endings.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/heK4r2Q/movies_2019_list_action.pdfIn PDF document text
    • http://senoratikazunub.22web.org/gelatososonufijewuxus.pdfIn PDF document text
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/4618711.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/ketobinimefoxunuzobepetow.pdfIn PDF document text
    • http://vujenixuwo.mypressonline.com/tesan.pdfIn PDF document text
    • https://depumubawaminuk.weebly.com/uploads/1/3/4/2/134236244/sezefujo-merevadidon.pdfIn PDF document text
    • http://juzikukunekaki.22web.org/48971780531.pdfIn PDF document text
    • https://jabakatuni.weebly.com/uploads/1/3/1/0/131071057/linukozofezu.pdfIn PDF document text
    • http://wovolutoxali.iblogger.org/89877474728.pdfIn PDF document text
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/tulaga.pdfIn PDF document text
    • http://bufanono.iblogger.org/application_letter_for_summer_job.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavopigorefu.rf.gd/88362433629.pdfIn PDF document text
    • http://kegenag.rf.gd/91506143797.pdfIn PDF document text
    • http://bamoxopigodarok.epizy.com/73670391203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/325001ee-3df0-4905-afbf-6dd6ab92c49f/38233505807.pdfIn PDF document text
    • http://fonivez.epizy.com/poisson_distribution_example_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858efea6-2025-45a4-97f9-c8fee55a87a8/8226619048.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_off00014136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 5860 bytes
SHA-256: d786fbe9c01e40e125734652bab554b7d384f846e7e4f63f620b92a92a7a7250
font_01_sfnt_off00015522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15522 11856 bytes
SHA-256: 717c68db34e78613b041b997fd688697c2708e64deeeb5f17f645d34f23077e2

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