Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6645fd9d73a8030…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 10:16:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0c6475b6006acc3c74ed114bae6fb6a7 SHA-1: 6b706161ba414b35ec698549a8c4eaa486e6f461 SHA-256: f6645fd9d73a80306b3cd01bbf1d1d121b6d363ac10c0c323295f730796a4630
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous external URIs, including one pointing to 'resalured.ru', which is indicative of a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to search results or document titles.

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://resalured.ru/strik?utm_term=cuales+son+los+derechos+mas+importantes PDF link annotation
    • https://cdn.sqhk.co/zigotimuti/nighgdT/38839824913.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/bOjbih1/ultimate_car_driving_simulator_mod_apk_download.pdfIn PDF document text
    • http://return-0.com/ghosts_n_guns_ar76agn.pdfIn PDF document text
    • http://tameeniraq.com/craftsman_router_table_combo_26501xciom.pdfIn PDF document text
    • http://nezatarofarix.getenjoyment.net/75981719307.pdfIn PDF document text
    • http://mini-cam2.club/84562755209szbom.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/ihmG0YL/real_car_parking_2_pc_indir.pdfIn PDF document text
    • http://xonigej.mypressonline.com/what_is_the_climate_in_havana.pdfIn PDF document text
    • http://stepka2016.xyz/nova_icse_chemistry_lab_manual_class_9rz3vx.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/perosivovoraliwufidodiv.pdfIn PDF document text
    • https://cdn.sqhk.co/wipabamof/WDhfie3/mozukoga.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/art_active_release_technique_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_f34f283450f2444a8267bdbe748ce284.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9620259-bf09-4054-958f-f80c788b1032/zoreserer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f95172-84c1-4b40-841a-6925100308fe/55576499054.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/6034534075.pdfIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_5826f29bec884638b7d1d6845ca2252f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/murudute/vabowep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 5220 bytes
SHA-256: 168f4ad0c6c51a22020b983cb1a55a81035c15b6b2dc15d186c270d31ace8c1b
font_01_sfnt_off0000fdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 1584 bytes
SHA-256: dec000e0970f68e4fe78892990680a75b144e49666fc4591249ca8dac4e543e1
font_02_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 11888 bytes
SHA-256: f8d5fa9ed6a86585a7997b8c6279738d3e5fc474980f2f493cdd5e79d0023f05

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