Malicious PDF — malware analysis report

Static analysis result for SHA-256 276e8fdfc47b38cb…

MALICIOUS

PDF

69.6 KB Created: 2021-03-21 07:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4419fce259b713b269402295f6e65dff SHA-1: 9808fe4e2165193caee97dbd4cd93b7a3470400b SHA-256: 276e8fdfc47b38cba879088dd6e066d835064704c06b737dfa37a555cc36af0a
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 pointing to SEO-optimized PDF documents, suggesting a link farm or spamming operation. One prominent external URI, 'https://pelibifir.ru/strik?utm_term=why+is+my+maytag+dishwasher+not+draining', is likely malicious and serves as the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=why+is+my+maytag+dishwasher+not+draining
    • https://rutarutan.weebly.com/uploads/1/3/5/2/135294158/8359811.pdf
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/4a7cbbd33c.pdf
    • https://cdn.sqhk.co/votojuxosaf/jbijsjf/4965075913.pdf
    • https://cdn.sqhk.co/dewozoju/4ggihge/76220192550.pdf
    • https://cdn.sqhk.co/gasubapo/DjaheJ1/stick_hero_unblocked.pdf
    • https://cdn.sqhk.co/zirigajer/1mheji7/kuwegerogom.pdf
    • http://beststudent.fun/wijagulorunejow38b8i.pdf
    • http://samelike.site/bipap_synchrony_service_manual9uzt0.pdf
    • https://cdn.sqhk.co/kebokeregim/ip1LDCA/t_i_idle_digging_tycoon_hack.pdf
    • https://xubivolimoba.weebly.com/uploads/1/3/0/7/130740090/7056151.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/262a29e7-7abd-46bd-814f-ff2212641486/the_alternate_day_diet.pdf
    • https://s3.amazonaws.com/jolunenafobuw/u.s._army_improvised_munitions_handbook.pdf
    • https://uploads.strikinglycdn.com/files/8efe3535-edc5-4d71-a8b6-fe63bfba413a/will_there_be_any_new_outlander_books.pdf
    • https://s3.amazonaws.com/jevedijadiki/hygromatik_steam_generator_manual.pdf
    • https://s3.amazonaws.com/pujirageg/rii_i8_wireless_mini_handheld_remote_keyboard_with_touchpad.pdf
    • https://s3.amazonaws.com/jifesu/invention_meaning.pdf
    • https://uploads.strikinglycdn.com/files/ffc985e7-707b-4aed-8600-0d8f3f882b33/64536024856.pdf
    • https://s3.amazonaws.com/wuvepilamamuse/craftsman_dgs_6500_parts.pdf
    • https://uploads.strikinglycdn.com/files/06580b48-f7be-42c0-8cf5-dd99eb691359/how_to_draw_santa_easy_and_cute.pdf
    • https://s3.amazonaws.com/wemazun/nuxuwibonamij.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_off0000d3a3.bin
2d190c5fce391defdddc07c5f60a8d102fb86fbe5edc0dccd06abd31cd88f698		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 5412 bytes
font_01_sfnt_off0000e600.bin
ee0bfc184439d42e4c26268cd586da8c35051a8fa00547688105ba3d5d1e7f92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 10272 bytes

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