Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cc7de363106ead…

MALICIOUS

PDF

85.1 KB Created: 2021-03-12 18:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 637dc3f37c2ca35ac3da1a58bf52171d SHA-1: 511d7b85854cdfb70cae32bb127b545b6681f139 SHA-256: 82cc7de363106eadb70886e9a278b62f3a8b48888b1c744f0842b01e3068675a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files, suggesting a link farm for phishing or malware distribution. The primary malicious URL identified is lozipotod.ru, which is likely used to host malicious content or redirect to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent.

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-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://lozipotod.ru/award?keyword=public+finance+and+taxation+questions+and+answers+pdf
    • https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/siwelunu.pdf
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/luwewewegox.pdf
    • http://komaxinatobofe.medianewsonline.com/java_8_features_best_tutorial.pdf
    • https://petavigavixate.weebly.com/uploads/1/3/4/4/134459614/fixogimeri_sired_lofoxagituzi.pdf
    • https://notetezowinebax.weebly.com/uploads/1/3/6/0/136019470/firipenev.pdf
    • https://sagagokibifaku.weebly.com/uploads/1/3/4/6/134625973/nasidakegulutofa.pdf
    • http://fovikoxesaweziz.medianewsonline.com/hp_envy_5530_printer.pdf
    • http://getiwiviji.22web.org/2131351221.pdf
    • https://lewelekokoje.weebly.com/uploads/1/3/4/3/134333059/dirufag.pdf
    • https://jimiwijir.weebly.com/uploads/1/3/4/5/134525211/6923da192.pdf
    • https://divulonuwuw.weebly.com/uploads/1/3/1/4/131482828/8266525.pdf
    • http://mugukix.mygamesonline.org/hamilton_flexbrew_how_to_use_k_cup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voropa/4679458688.pdf
    • https://uploads.strikinglycdn.com/files/af485f4d-4653-46b1-94c5-3b4c1587f7c8/72395436804.pdf
    • https://uploads.strikinglycdn.com/files/38fb9b8c-17aa-42c8-bc7a-e0c6c3927c80/zupobe.pdf
    • https://uploads.strikinglycdn.com/files/5ee82edf-04d5-4bbc-af09-f9e5082bb4ec/75537809387.pdf
    • https://s3.amazonaws.com/kikunojulejuj/best_way_to_listen_to_music_at_home_2020.pdf
    • http://galojuxutiwas.epizy.com/superannuation_nomination_form_for_employer.pdf
    • https://uploads.strikinglycdn.com/files/790b6fef-8812-4b83-a68a-f0915a8c7791/vitamix_soup_recipes_vegan.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_off00010daa.bin
c1a70525b0a1e2c9544d510669ec20e454ebab1850dbefcca9405de144baff40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 5576 bytes
font_01_sfnt_off000120c1.bin
93835d87f4c717da58ccb961dad944b0a9b6ca3ebf44c688ce6b944371ad10e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 11280 bytes

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