Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e318743998e056…

MALICIOUS

PDF

74.3 KB Created: 2021-06-07 00:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8736134c8d788a2f2bc1a474ead90a3a SHA-1: a553fea088140cc0c983c251730272786697b14c SHA-256: 74e318743998e056e5dd0e1847795573aff78daaab50eb2a0ce57481db32277e
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 0.9997

Heuristics 6

  • 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.
  • 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://crysiq.ru/pbw?utm_term=state+and+action+verbs+exercises+pdf PDF link annotation
    • https://negapopede.weebly.com/uploads/1/3/5/9/135994143/2354480.pdfIn PDF document text
    • https://guwidavimup.weebly.com/uploads/1/3/4/8/134893931/5144078.pdfIn PDF document text
    • https://fejiwapofiji.weebly.com/uploads/1/3/4/6/134699364/a57079efbfca.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/3390f3af5f9b0b.pdfIn PDF document text
    • https://pozufijuxib.weebly.com/uploads/1/3/0/7/130775557/3bffe0068f73.pdfIn PDF document text
    • https://jikevisanudopud.weebly.com/uploads/1/3/4/0/134017539/vavovivebowudeg-wavimekisoli-xogusinute.pdfIn PDF document text
    • https://bozobazevadetob.weebly.com/uploads/1/3/1/6/131607158/fejikepuguv.pdfIn PDF document text
    • https://majojolug.weebly.com/uploads/1/3/4/5/134595566/1813818.pdfIn PDF document text
    • https://kulazizuwajo.weebly.com/uploads/1/3/7/4/137498773/bavufobi_zazenixi_maximelol.pdfIn PDF document text
    • https://wexegupewafux.weebly.com/uploads/1/3/4/4/134443826/rapofoponolivabizule.pdfIn PDF document text
    • https://fataleripe.weebly.com/uploads/1/3/0/9/130969718/masamizi.pdfIn PDF document text
    • https://wupizesave.weebly.com/uploads/1/3/4/5/134581048/f63f9e1f54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zexowisam.pbworks.com/w/file/fetch/144629715/gewirujigesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b38d433-27a4-4c7d-9486-bffa7461bde1/neopost_in_300_manual_amount_entry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b5b8517-fccd-4c20-a9d5-c18d9ee8c64f/whirlpool_wdt720padm1_control_board.pdfIn PDF document text
    • http://dumogaluz.pbworks.com/w/file/fetch/144620418/50552581328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d25fdc-1c9c-49fb-8cfb-6344ac0b577a/hp_z400_motherboard_bios_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6035cc-291d-44e0-9fea-37d0ff24f736/monster_2004_anime_dvd.pdfIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144465438/lojenilujafenafegitu.pdfIn PDF document text
    • http://zivovot.pbworks.com/w/file/fetch/144631479/21774171006.pdfIn PDF document text
    • http://zeratuwolima.pbworks.com/f/download_harvest_moon_fomt_bahasa_indonesia_gba.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_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 5488 bytes
SHA-256: 325aa4707410b37ee18bb0e8e4d18f109e5f29d00c3776b2424291f18e34c5d0
font_01_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 10244 bytes
SHA-256: 9792f99fe2ebd3531023e062dfdfbd8d8c8200d13430caf9f957062c0f89bf4d