Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02563696f7a19bb…

MALICIOUS

PDF

69.3 KB Created: 2021-04-08 04:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8389d2eb28920fe5595f184c483d02b2 SHA-1: 32ac329cb0dfc456aa47fb5e2e857d5e59a1c036 SHA-256: a02563696f7a19bbefa8bb97472a3d0b85632032f8cc65d71786e052495e0c7e
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate a strong intent to redirect users to other sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=lg+wm3470hva+parts+list PDF link annotation
    • http://lavka-karamel.ru/6693501966wware.pdfIn PDF document text
    • http://tuimag.ru/adobe_premiere_pro_cs5_5_free_download_mac8ehgg.pdfIn PDF document text
    • http://creditpm.com/18277100019mnj2m.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/84461601126.pdfIn PDF document text
    • http://zavodtriumf.com/how_to_put_music_on_nano_ipodokq6y.pdfIn PDF document text
    • http://slampochka.ru/ham_radio_deluxe_manual6yv9d.pdfIn PDF document text
    • http://sevastopol.sale/7266943953e2z9i.pdfIn PDF document text
    • http://coolstudent.space/fowezolofariweju50fuq.pdfIn PDF document text
    • http://outputqwvk.space/kitudot8nyb9.pdfIn PDF document text
    • http://tibijosetinaj.getenjoyment.net/88267038105.pdfIn PDF document text
    • http://boevoenlp.com/how_to_change_battery_on_ipod_touch_4th_genqr0uu.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/lodazojamuva/the_secret_julie_garwood_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/20118768873.pdfIn PDF document text
    • http://timojodabemisux.myartsonline.com/35659319229.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/42642192583.pdfIn PDF document text
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_13c4ae9f48624e28878e726e866b18bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/dhhs_guidelines_for_hiv_treatment.pdfIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_ca7127ae1cca46a0bc66f10b9caae4d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buwosevax/48489495235.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/how_long_should_jerky_stay_in_a_dehydrator.pdfIn PDF document text
    • https://e2685184-9bcc-4d63-b126-5f7cf6655de3.filesusr.com/ugd/267f13_90b44f8b368049719bfbd55973f69403.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fivebo/wahl_beard_trimming_guide.pdfIn PDF document text
    • http://penanaras.myartsonline.com/zugek.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_e2c7304051894f67a9ee4063a404ce08.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_off0000ce73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE73 5800 bytes
SHA-256: d0989eeafb0049b9d82c03768042eea8838ba1b7232e865d195fdb73df4f36ac
font_01_sfnt_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 10548 bytes
SHA-256: c0d5b7e600b46a3cadcbddfa12c11f4dc07cfd20e4086a042eab61d47a800c8b

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