Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f96c1d670feef0…

MALICIOUS

PDF

82.6 KB Created: 2021-03-21 05:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12a827fe0c2a7da52ad9cf1a30db1a56 SHA-1: 18c564ad5dc05b55048872d7d4240e66b913060b SHA-256: 69f96c1d670feef079ef3497bedaed63d2befbcff3ac54a1c2151ce5696b163e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are designed to redirect users. The primary malicious URL, 'https://pelibifir.ru/strik?utm_term=how+to+print+checks+from+quickbooks', is presented as a lure related to QuickBooks, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://pelibifir.ru/strik?utm_term=how+to+print+checks+from+quickbooks
    • http://vegunax.getenjoyment.net/44697153357.pdf
    • http://maxiteguf.medianewsonline.com/jepesopodu.pdf
    • http://juxowupekabaf.mygamesonline.org/business_english_phrases_and_vocabulary.pdf
    • http://kaxavetaxudu.mywebcommunity.org/42667021750.pdf
    • http://kazexajisodibu.medianewsonline.com/govesizagakus.pdf
    • http://lomigakorak.getenjoyment.net/fast_and_easy_crochet_stitch_for_baby_blankets_89.pdf
    • http://lerimofo.mywebcommunity.org/technical_analysis_investopedia.pdf
    • http://modezewop.mygamesonline.org/totenunuwigo.pdf
    • http://lebedugipul.mywebcommunity.org/keputusan_dirjen_bimas_islam_nomor_713_tahun_2020.pdf
    • http://fulokixowo.scienceontheweb.net/33198822744.pdf
    • http://sipataj.sportsontheweb.net/bukelagawibapogijuxufeli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://weparaxopulo.atwebpages.com/vumenejekud.pdf
    • https://s3.amazonaws.com/busutafitufe/furizaf.pdf
    • https://uploads.strikinglycdn.com/files/df074542-7a7e-4362-9774-5574f6253d66/what_are_examples_of_sensory_language.pdf
    • https://s3.amazonaws.com/vibasujefir/vatezotixenexenoxiv.pdf
    • https://uploads.strikinglycdn.com/files/3dfc20f2-f0e1-4872-a869-942f93944523/bepalaxidinakir.pdf
    • https://s3.amazonaws.com/bulolimepol/sole_e25_elliptical_shipping_box_size.pdf
    • https://s3.amazonaws.com/vidadaviwal/how_to_delete_search_history_on_google_maps_iphone_6.pdf
    • https://uploads.strikinglycdn.com/files/f30c9b23-eece-42ab-8dc6-086a41949d8f/how_to_structure_a_chapter.pdf
    • https://uploads.strikinglycdn.com/files/b07c280a-b62a-40f4-adaa-2725389c06eb/sutanak.pdf
    • https://uploads.strikinglycdn.com/files/15b0ed86-110e-480c-a72c-d9b62eb1599d/sekoxetitu.pdf
    • http://biwosagamivi.myartsonline.com/10305724194.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_off000104b3.bin
70418cab2f803586a0dee4f9e85e9cb9249db6afd3d7539148b1101e71d9e0f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B3 5396 bytes
font_01_sfnt_off000116fe.bin
a80752c8b6e6c570810d2f27c35bb6528b0d894a647e91aa4c2c025cd7b9a371		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 11312 bytes

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