Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1dd5faf7e19d11…

MALICIOUS

PDF

84.6 KB Created: 2021-05-16 08:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2cb6653344b2dc65f89fa697132b9755 SHA-1: 220f8d46d78fcb20bbf1b3d3952770ad9e69ba96 SHA-256: fa1dd5faf7e19d11c78cb1bf4cbc30dd3b2afc9ea577b4c91b7ed49754236ee3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in link farms to artificially boost search engine rankings or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lead users to compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://resalured.ru/strik?utm_term=lean+startup+book+barnes+and+noble PDF link annotation
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/490dd232.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/general_electric_company_annual_report.pdfIn PDF document text
    • http://connexion-amelii.xyz/cad_2010_keygen_freeoouq6.pdfIn PDF document text
    • http://bigpleasure.ru/can_i_get_a_good_workout_on_a_recumbent_bike4yiz6.pdfIn PDF document text
    • http://optamorem.com/36607072535ullku.pdfIn PDF document text
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/7350776.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/2999261.pdfIn PDF document text
    • http://chebsvet.ru/84446426784s5f2n.pdfIn PDF document text
    • http://kuxemanes.medianewsonline.com/dijatomupi.pdfIn PDF document text
    • http://reliables.ru/19447538965zcl7h.pdfIn PDF document text
    • http://vosojivaru.mypressonline.com/ccna_200_125_download.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/3024097.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/moposuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/nixuxexavuz.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/jebekutojuzuxidagise.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/sig_sauer_p239_iwb_leather_holster.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/how_many_words_should_my_24_month_old_be_saying.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/biotechnology_genetic_engineering_information.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/which_parent_functions_have_asymptotes.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/spider_man_hd_wallpapers_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/moultrie_field_camera_instructions.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_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 5100 bytes
SHA-256: fdc092c0c48da23ed60659148081ec916b497682e5458f596f3e0cc8df5901d8
font_01_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 12008 bytes
SHA-256: d39f79f2c9f68b287ee1cbed0cf786f0ba0581113a766354533e0226ba82721f

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