Malicious PDF — malware analysis report

Static analysis result for SHA-256 087f940e9b377054…

MALICIOUS

PDF

73.6 KB Created: 2021-03-23 20:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4120d1be0fb14be6a79f3ffec4464f9f SHA-1: 1c6dc39e1bd729b5a8a37bc7efd11ab3b258e159 SHA-256: 087f940e9b37705423323256881b05c9eabf288fdbd30c9a67295ebba1c00b6c
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and confirmed by ClamAV detection. The ML classifier also flagged this PDF with a high probability of being malicious. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/award?keyword=census+and+sampling+pdf In PDF document text
    • https://cdn.sqhk.co/naxokujim/JGhhcic/eset_parental_control_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/jie03he/dragon_quest_minecraft_game_boy.pdfIn PDF document text
    • http://nivakagudan.22web.org/beautiful_background_for_photos_free.pdfIn PDF document text
    • http://atomlinux.com/okihiro_when_and_where_i_enterb28bo.pdfIn PDF document text
    • http://katermore.ru/lidizegodesuwfea.pdfIn PDF document text
    • http://kezinogirojosev.iblogger.org/anger_management.pdfIn PDF document text
    • http://chunyoo.com/boriragofenapijwhuo2.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/egjidDj/whatsapp_messenger_app_play_store.pdfIn PDF document text
    • http://wajofima.mywebcommunity.org/stihl_fs_56_rc_gas_mixture.pdfIn PDF document text
    • http://lakshmi-store.ru/please_be_informed_ngha_l_gorzag.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/kovilet.pdfIn PDF document text
    • http://libertinemodels.com/4766902604072lvq.pdfIn PDF document text
    • https://cdn.sqhk.co/wanowofimaz/iaMbqii/nunafaso.pdfIn PDF document text
    • http://wowuzarupi.iblogger.org/vunobokosegopunabopije.pdfIn PDF document text
    • http://ratedewu.scienceontheweb.net/best_laid_plans_sidney_sheldon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zopatirek.epizy.com/metodologia_tecnologia_e_informatica_scuola_primaria.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/mulozatolegovawitaw.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/how_do_volcanoes_affect_peoples_lives_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/84983125835.pdfIn PDF document text
    • http://tikomiwewo.atwebpages.com/3256948221.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/27239564777.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/learn_korean_textbooks.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/5749386919.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/14023496691.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/city_codes_in_indian_airport.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/xexikate.pdfIn 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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 5168 bytes
SHA-256: d7db7c2d22ea7542a71eb3ae565b92eea5a707bb94b7f739bd74e4077967a352
font_01_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 10656 bytes
SHA-256: 602a8ee2849e0e4852c66a10e4b9392e059027aedfcc929f811b775c518bc5fa

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