Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90e72401bffbda1…

MALICIOUS

PDF

78.0 KB Created: 2021-03-08 10:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b19f037b5bfd20a53c86ece77d5e6bdb SHA-1: aad08a21f7491e9aa75ce5cea405f3c453127acd SHA-256: f90e72401bffbda15f3dab8a9846ca37aa8653787ef586d3f7226ad33e269be5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains and are likely part of a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a 'wiring diagram', which is a common pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://midufefew.ru/strik?utm_term=paragon+defrost+timer+wiring+diagram PDF link annotation
    • http://jirekakeduvinij.22web.org/pet_sematary_1989_zelda.pdfIn PDF document text
    • http://fotogodopuxet.iblogger.org/vegan_muscle_building_diet_plan.pdfIn PDF document text
    • https://fizinizaboz.weebly.com/uploads/1/3/5/3/135304720/8085734.pdfIn PDF document text
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/dd1dcc.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/81536415272.pdfIn PDF document text
    • http://todipagomize.iblogger.org/como_transformar_de_alqueire_para_hectare.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/gesaxa_jesisove_xinubuvoguxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_4d52166220f6446db29de9fe97f91d86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f045c20-2868-425d-8fca-09448532c5cf/zavugi.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/practice_test_1_reading_3_answers.pdfIn PDF document text
    • http://muwiliwus.epizy.com/introduction_to_modern_photogrammetry.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/91755013748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a225a3b-a189-4cd8-9677-56b6d3332c18/bosch_nexxt_500_series_washer_error_code_e01.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/is_onyx_safe_to_drink_from.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/jasirixanep.pdfIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_5905e0b8b49e4b73a89a10f09ab8ce94.pdf?index=trueIn PDF document text
    • http://zekafoweratum.epizy.com/fimibasulejegaxarofozed.pdfIn PDF document text
    • http://positajugopisu.myartsonline.com/dyson_dc39_washable_filter.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_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 5288 bytes
SHA-256: df6e472f2330e3b0bb5ae6f6420fc3dfc25485eaaf97680734f0199267ac727c
font_01_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 11844 bytes
SHA-256: 2c599e9866431f0b1770f0e53ef8b05ccaad261ea11470352d5fdac3073da4a8

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