Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5ed8f9823ec716…

MALICIOUS

PDF

74.7 KB Created: 2021-03-15 13:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0178492f23374b2c0342ef9e7a64ee3c SHA-1: d1416f6b3ed09373941d858e6c54260fe313abab SHA-256: 3f5ed8f9823ec71613edc8f8d8d6210d07bd3e6ef72133ef99effb28b602a75f
186 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. 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 0.9988

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=ford+4500+backhoe+manual PDF link annotation
    • http://zibenavepasapep.iblogger.org/vixunalusa.pdfIn PDF document text
    • http://gramnews.xyz/91416976752o9pg8.pdfIn PDF document text
    • http://loduxoxoba.22web.org/xekibuduwitokire.pdfIn PDF document text
    • http://trujillostacoshop.com/73762430243be1e4.pdfIn PDF document text
    • https://jomupalekiloja.weebly.com/uploads/1/3/4/3/134310494/tabumitefag.pdfIn PDF document text
    • https://dawipufa.weebly.com/uploads/1/3/3/9/133986453/wupuxit.pdfIn PDF document text
    • https://purapunebofo.weebly.com/uploads/1/3/4/8/134888030/zujira.pdfIn PDF document text
    • https://vidolatukala.weebly.com/uploads/1/3/5/3/135316506/9519056.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/c665178c09af3dd.pdfIn PDF document text
    • https://gegovowazuravas.weebly.com/uploads/1/3/1/3/131398401/jedemot_vuloribajabis.pdfIn PDF document text
    • http://mini-cam1.club/insya_allah_sah_2_lk217fbib.pdfIn PDF document text
    • http://olymptrade.buzz/rs_aggarwal_maths_textbook_class_8_free_downloadsizbu.pdfIn PDF document text
    • http://romeoplanet.club/muvagudidifuduxekemzuihp.pdfIn PDF document text
    • https://morapunepa.weebly.com/uploads/1/3/1/6/131606469/4dde5da9af3.pdfIn PDF document text
    • https://semoburepov.weebly.com/uploads/1/3/2/8/132815840/56ffeb5bb8ebdd4.pdfIn PDF document text
    • http://gotedez.22web.org/cisco_catalyst_2960x-_24ts-_l_datasheet.pdfIn PDF document text
    • https://gosopitodemeku.weebly.com/uploads/1/3/4/8/134874694/famajekeroroteronur.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://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_56adb8ef468f42718ca85d2332aad8dc.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_b57fca1f306f4a23b3d2702ee0332124.pdf?index=trueIn PDF document text
    • http://gadoxijumulop.epizy.com/vowexuromozigibawas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd40dfb-eae8-4d2b-959c-03d247c99f6d/nanostation_m2_firmware_6.0.1_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e54c14-3610-40df-9b5a-c4fe68709751/wonizunuzosabav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6c747b-a54c-457d-b5e1-0672d3e09e56/sherlock_holmes_a_study_in_scarlet_short_summary.pdfIn PDF document text
    • http://livufuxe.epizy.com/1646823903.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_1332252ea0ef4ea6b2a355dbb28f96d6.pdf?index=trueIn 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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 5268 bytes
SHA-256: 0194cefb2a97b723d61a0d44c37cf56a03fe62f5d0e6eda144b816eaf9702889
font_01_sfnt_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 10072 bytes
SHA-256: e1388d47ff9bc380b2071ef2939f0ab17cf393293c1d176f0d34d21d25e1014c
font_02_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c