Malicious PDF — malware analysis report

Static analysis result for SHA-256 4401fd7463336fc3…

MALICIOUS

PDF

79.8 KB Created: 2021-03-27 18:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 778d02fa3857cbcbb2971a669ac3d766 SHA-1: 7c1148da28589cd0898fbd2aedc14e58f6f2cd37 SHA-256: 4401fd7463336fc341c85a203417faf535633c1adb175112ab90c34e23fc9d61
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URLs identified are vilenefex.ru and fosonelotila.medianewsonline.com, suggesting a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/award?keyword=asnt+rp+snt+tc+1a+pdf
    • http://fosonelotila.medianewsonline.com/burapaz.pdf
    • https://cdn.sqhk.co/jufebarur/Xjgihjf/fun_reading_ideas_for_middle_school.pdf
    • https://cdn-cms.f-static.net/uploads/4403260/normal_5fd1092fbf7b9.pdf
    • http://lajodibibodi.getenjoyment.net/zarenetefatimumadakaxix.pdf
    • https://cdn.sqhk.co/bubiwalifeda/jijfbhb/best_brawler_in_brawl_stars_2020_october.pdf
    • http://tuvurebomiworo.scienceontheweb.net/37931815529.pdf
    • https://static.s123-cdn-static.com/uploads/4392210/normal_5fe312e2801e4.pdf
    • https://cdn-cms.f-static.net/uploads/4370317/normal_602c0b8f3b836.pdf
    • https://cdn-cms.f-static.net/uploads/4470027/normal_5fd256953f57d.pdf
    • http://potuxoposutu.medianewsonline.com/zidisebiregimipep.pdf
    • https://cdn.sqhk.co/mizipudi/ghftI2O/mudding_locations_near_me.pdf
    • https://cdn.sqhk.co/winelolibug/uhfgdDn/how_to_add_stickers_on_snapseed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/748d76f3-2e1b-49ce-8371-bd660b5c5e8a/the_kid_who_ran_for_president_activities.pdf
    • https://uploads.strikinglycdn.com/files/ad763dd8-80fc-415d-a3bd-1c49f10d9551/what_is_another_word_for_making_progress.pdf
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_cf7e5c54b2644bcc8a249d112607d29a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/15ad8ee0-a22c-410b-9a7a-27e6e5a0109b/zufokedejidepelikogalep.pdf
    • https://uploads.strikinglycdn.com/files/b635c842-7c55-4a2a-991c-a617725c5816/955569848.pdf
    • https://uploads.strikinglycdn.com/files/84009072-4b0b-4bf0-83bc-7b8256bdaa3a/panasonic_lumix_dmc-fz70_manual_espaol.pdf
    • https://uploads.strikinglycdn.com/files/b27c6cbb-9fb9-448a-b183-6697d768bcc8/80647565870.pdf
    • https://uploads.strikinglycdn.com/files/20d84222-a899-463f-9548-ee22070453a8/97679812148.pdf
    • https://uploads.strikinglycdn.com/files/cfbbefd0-8b60-4561-9715-636d614bfc41/kiss_the_rain_yiruma_sheet_music_easy.pdf
    • https://uploads.strikinglycdn.com/files/0ff12529-c431-4c63-9bd6-b3839d5ccc08/hp_10bii_financial_calculator_change_decimal_places.pdf
    • http://sofibimibojas.myartsonline.com/xujosotubob.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_f521aca86be94afe862ba52abcbd2a08.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eddb.bin
a788dd15a22feb2ff2411aefa91daea287a911a3d37d5324329692500c3ef438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 4668 bytes
font_01_sfnt_off0000fdae.bin
a2354d07e0c1623375069589dec9ef68d0495ed453997e5b3a96aaa4951a6c1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 11144 bytes
font_02_sfnt_off000123cc.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 4324 bytes

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