Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4244d4e9ee6cf6…

MALICIOUS

PDF

78.3 KB Created: 2021-06-04 15:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2dd8a7365f72917145216ffd1253cb5d SHA-1: bdb33e087890347cb5237809947a3b7dbd65dce8 SHA-256: 6d4244d4e9ee6cf6bf287dab0fba5da554e02e86f301e20dcb4d1cc02e0e1f31
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, embedding numerous external URLs, with a primary lure related to 'Pnc challan form pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, but the extensive link farm suggests an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=pnc+challan+form+pdf PDF link annotation
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/79dec331b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_5fe68c6c23824.pdfIn PDF document text
    • https://fibimijisu.weebly.com/uploads/1/3/4/4/134461798/tevawazifox-bubexeriz.pdfIn PDF document text
    • https://nevonanopovew.weebly.com/uploads/1/3/4/3/134335048/wuguwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490953/normal_60508d37c2444.pdfIn PDF document text
    • https://kufaxalerix.weebly.com/uploads/1/3/1/4/131453821/7017121.pdfIn PDF document text
    • https://xebubezapabiw.weebly.com/uploads/1/3/5/3/135327697/jikon.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/kikume_bogipikuzake.pdfIn PDF document text
    • https://ditikoxariwifip.weebly.com/uploads/1/3/4/6/134636805/125422.pdfIn PDF document text
    • https://wewodagib.weebly.com/uploads/1/3/4/2/134266566/wofagosobuxifi.pdfIn PDF document text
    • https://waxopudiva.weebly.com/uploads/1/3/4/6/134695928/3814510.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144608061/physical_fitness_merit_badge_workbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88ec965-8fb8-45f7-977f-562a5690bdd8/can_you_use_ace_high_in_cribbage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e47368-f7b5-4fd8-9dd4-f1fb2fe58cfc/16349092357.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/f/38_bcs_written_result_2020_download.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144462684/ulead_video_studio_11_full_version_free_download_with_crack.pdfIn PDF document text
    • http://xinunubaz.pbworks.com/w/file/fetch/144569745/python_programming_book_for_beginners.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_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 5216 bytes
SHA-256: b6812ee88afbeb9f396f8b0c8b02b45e36fc40f96a38e8b0951f82d13a7f2173
font_01_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 10932 bytes
SHA-256: 42e00c60e6b95da0dd43feddcbd3877cd242f410f53e015aa15c43b2c5a76371

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