Malicious PDF — malware analysis report

Static analysis result for SHA-256 573c75edf5f9f5ff…

MALICIOUS

PDF

66.1 KB Created: 2021-03-13 17:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dac941f4e3e033577d61235acb2dfc9b SHA-1: 92b2973dc7602afc59bdbc491e96d920c16f92c0 SHA-256: 573c75edf5f9f5ff67611e07491ceee6f8c77d37eb58814390df13aca8be87f6
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=moto+x3m+winter
    • https://cdn.sqhk.co/sobexofap/Aiitp86/jikeludegizusogoxenulewun.pdf
    • https://cdn.sqhk.co/merabuvi/ifehigh/7639066833.pdf
    • https://cdn.sqhk.co/nazopekujavi/WLigBKY/best_sharpening_steel_rod.pdf
    • https://cdn.sqhk.co/leperanurosi/gjehhij/zegubivabime.pdf
    • https://cdn.sqhk.co/tatudawo/ggdhjig/english_party_songs_list_2019.pdf
    • http://lijonotogi.scienceontheweb.net/husqvarna_125b_parts_list.pdf
    • https://cdn.sqhk.co/xonarewu/gijjfE7/death_incoming_level_59.pdf
    • http://lnstagramverifycentre.com/66688396438qql2v.pdf
    • https://cdn.sqhk.co/pofaxiniraz/heZGeha/world_robot_boxing_2_apk_download.pdf
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/182a55674.pdf
    • https://cdn.sqhk.co/fiseguvugele/I4zkQie/39277962132.pdf
    • https://wedikeme.weebly.com/uploads/1/3/1/6/131606111/putepajuxux.pdf
    • https://fasukawoj.weebly.com/uploads/1/3/1/4/131453618/sugidile_muxunotaxut_kirenubufor_duregolosaj.pdf
    • https://jonenatone.weebly.com/uploads/1/3/1/8/131872225/biwexukududog_taline_jibir_miwunana.pdf
    • https://cdn.sqhk.co/rabataxuvax/Mhh2mja/street_sweeper_driver_jobs.pdf
    • http://vemelaribox.getenjoyment.net/50967591488.pdf
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/6550212.pdf
    • http://usesucre.pro/wilinokuwushg5b.pdf
    • https://cdn.sqhk.co/pabelewexo/gjOjfgW/secret_of_mana_character_40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_1934b5e6a7bb4719bc7ef70f745ba784.pdf?index=true
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_7fbcc18b19e4476d85ade232b6eaed56.pdf?index=true
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_0443443353ea40c08705b2bff886d78c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c938.bin
9f53536a65e5cc4fd7e5d8bf69e85e2cf814631acf0a8bcfc7a0fbe381b67873		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 4740 bytes
font_01_sfnt_off0000d964.bin
8eb2725c0eb3cb83820868be1b6349fb9d3132427088f2a03c2803e004f529bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 9948 bytes

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