Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ff7a8589b38a4b…

MALICIOUS

PDF

80.5 KB Created: 2021-04-24 10:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3c5fd3287da227833d2c101d7eecea36 SHA-1: 73bfc6670e67fa372d852735af4d989cfa7c2a71 SHA-256: 97ff7a8589b38a4b3526323ad1b6ee9e68abcd6069d8724a8413737696e8730d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=autocraft+battery+charger+manual PDF link annotation
    • https://cdn.sqhk.co/nurofiwele/8xhjjbE/totally_accurate_battle_simulator_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/jghh1t5/54612997097.pdfIn PDF document text
    • https://cdn.sqhk.co/zoburawava/fjc7ja1/47142649356.pdfIn PDF document text
    • https://direvegafazago.weebly.com/uploads/1/3/4/4/134491376/jiroz.pdfIn PDF document text
    • http://bulibujirifubof.scienceontheweb.net/44036436130.pdfIn PDF document text
    • https://cdn.sqhk.co/bexikerez/ypjb0bA/86583377041.pdfIn PDF document text
    • http://bekokax.getenjoyment.net/laporan_kasus_pneumonia_pada_anak.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikuzi/bhchdch/29523714378.pdfIn PDF document text
    • https://nomomiwadij.weebly.com/uploads/1/3/3/9/133997716/voxagi_jakojuzejube.pdfIn PDF document text
    • https://nikubasixuza.weebly.com/uploads/1/3/0/7/130738960/rebezinikino.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/djTrggk/gimat.pdfIn PDF document text
    • https://cdn.sqhk.co/nixagigad/fgdBnje/tauceti_vulkan_technology_benchmark_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/gh5igih/weblogic_administration_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/aiKvMll/pitch_perfect_instrument_tuner_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/G7iiHgj/piano_keyboard_image_to_print.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/william_shakespeare_sonnet_poem.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/bufomawosilafurijop.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/2346042c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://badamowafe.onlinewebshop.net/curso_de_apologetica_catolica.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_f17b2cc91b744e2094d09e80c48b2aa6.pdf?index=trueIn PDF document text
    • http://zogosugo.onlinewebshop.net/85693344438.pdfIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_eee9130fa1004ca8a3d3cdceaa237965.pdf?index=trueIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_f5af0193a5ac484699b138990ac28260.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_894df074b4564c38a424966316d3abbd.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 5348 bytes
SHA-256: 623a9fd6b1a0fe8d45c51d8ab84abf9a93dcf88868176be5ca22a6822468212a
font_01_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 11132 bytes
SHA-256: a9bd188c256421fb9e83ec3d2a2c7834f9feb14066c621b69f375a8dae0d3766