Malicious PDF — malware analysis report

Static analysis result for SHA-256 64aa75e24440e784…

MALICIOUS

PDF

88.6 KB Created: 2021-03-17 02:55:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5e04cbcc02ab32046ef06e36e759f7a1 SHA-1: c792ef473dd29cb2c521afc1cf045cfa0083ee2f SHA-256: 64aa75e24440e7842852dbbc367f27cc5481c87f527eb1e07264759281cf2e74
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jottigo.ru/award?keyword=alphabet+annual+report+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413851/normal_601c01a025c9b.pdfIn PDF document text
    • http://ig-socialmedia.xyz/teach_like_a_champion_field_guide4kvaz.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/fegep_lajuv_fikekok_sosigukeguneti.pdfIn PDF document text
    • https://vakozumemarob.weebly.com/uploads/1/3/1/0/131070483/4e2c0.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/8092593.pdfIn PDF document text
    • https://fuguweraxawu.weebly.com/uploads/1/3/4/6/134684603/dames-juganuxo-bumamokijuka-tozezekadebata.pdfIn PDF document text
    • https://fiwitoritare.weebly.com/uploads/1/3/4/5/134582968/b9023a89b07f.pdfIn PDF document text
    • http://trysoda.pro/gulenaczt0a.pdfIn PDF document text
    • http://bostpolamos.site/sonicwall_tz_100_manualn3kng.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480889/normal_6005ae5d60ca9.pdfIn PDF document text
    • https://kevofogag.weebly.com/uploads/1/3/5/9/135962027/a8376311cc9.pdfIn PDF document text
    • https://gutazalofekeva.weebly.com/uploads/1/3/5/3/135395177/moguroxavi.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/dukibuniwefi.pdfIn PDF document text
    • https://wabaxudazisivi.weebly.com/uploads/1/3/3/9/133986682/6897438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382629/normal_60063623c1824.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/8110109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_5fdb9229a5bad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5fe3d685d8599.pdfIn PDF document text
    • http://eushopvmn.site/what_is_the_meaning_of_islam_in_malayalamevtcw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c574e0f5-f412-4520-adc6-45cb927d71b9/95822640086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34b5786-e7c9-4f1b-b63b-1a8eab07e31f/mvc_interview_questions_2020.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_423c876ecea44889960df6b71fb4e080.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_86cbd3cab030488988f2b60bd3855633.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a1909b-669b-45fe-ba05-11ed55628e95/81011826040.pdfIn PDF document text
    • https://a6053a4b-6066-498d-92a8-7748b68531bc.filesusr.com/ugd/5f0d2f_3d9c5d5a62484e58b04748514e25eb4a.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 5356 bytes
SHA-256: 7ba35a49291786ed79b096c0a4810848b7f80c6741951b0ee8f869cb098d97ab
font_01_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 11820 bytes
SHA-256: 44fab519fc28077b981bb5683233a1f3fcd9818bd8db0348e57e5c2f9b5c6348
font_02_sfnt_off000140e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E9 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330