Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf442bf7b4a8518d…

MALICIOUS

PDF

76.1 KB Created: 2021-03-01 08:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67a2f5b7b490d7f9b61d288c97983a06 SHA-1: 1b84fe907a551b95a294456f86ea353cf93206d8 SHA-256: bf442bf7b4a8518dd87e767e24d988edbb9e72d79df7d5ef69ae7ebc4a869efb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://jumiwimov.ru/aws?utm_term=how+much+does+psychologist+earn+per+month, is embedded in the document, likely serving as a lure to direct users to a potentially malicious site. No scripts were extracted, but the extensive use of external links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/aws?utm_term=how+much+does+psychologist+earn+per+month
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/tukadamiparaked_virima_mexewukaragi_bomufaxefuna.pdf
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/losuxigipewuk-bedulonuzik.pdf
    • http://tofotibuwul.sportsontheweb.net/how_to_fix_printer_error.pdf
    • http://shoop-fe.ru/toddler_words_that_start_with_ht5zkv.pdf
    • https://cdn.sqhk.co/bagudivibi/6gjhgB5/buguwumomudebegoxijuwemo.pdf
    • https://cdn.sqhk.co/kewixoretuze/fibhahg/80424160204.pdf
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/nakinopijixiza-pujonuk-kawuwo-lazeradapa.pdf
    • https://rupuxiziwaxez.weebly.com/uploads/1/3/4/7/134765543/239f86d.pdf
    • https://cdn.sqhk.co/mavozopofug/Ghgijja/siwawatawinoderokisidize.pdf
    • http://kyrgyztours.com/harry_potter_book_titles_in_frenchzhz3o.pdf
    • http://vevovifox.scienceontheweb.net/tusexojufuv.pdf
    • https://buruwezixefekiw.weebly.com/uploads/1/3/0/7/130738548/dudotesomad.pdf
    • https://busaluvugisegiw.weebly.com/uploads/1/3/4/3/134368440/vupakuzogapinodebe.pdf
    • http://bufo.online/the_last_song_book_charactersce8su.pdf
    • http://busforpay.online/world_war_2_cod_zombies_maps6qimr.pdf
    • https://ninibukakogim.weebly.com/uploads/1/3/2/8/132815385/889648.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lerezazo/21178176213.pdf
    • http://manosotidokef.myartsonline.com/getavejikawoka.pdf
    • http://vumamuv.myartsonline.com/how_to_sync_airtel_dth_remote_with_sony_tv_remote.pdf
    • 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_off0000ebd4.bin
de95e39b6d0c5d677334dac9806ab99f422f3ba15209e4e3e5dbd6fe7e02672b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 5644 bytes
font_01_sfnt_off0000feef.bin
a9ae486f70d33e16626f2cd25f92f87094d98acfa3b8900d6edf15f0f4ad0810		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 10660 bytes

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