Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a3fc84fcd3050d…

MALICIOUS

PDF

75.4 KB Created: 2021-03-31 18:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2002bf7bbc69f19a9d9f38cb0465931 SHA-1: 91694c51de0e46ca6caf7f923ebcc94dad87b78b SHA-256: d7a3fc84fcd3050d471763e8161d33011ffbaabd8f7ad4e146994cb9dfd61fff
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent link pointing to 'https://ponafet.ru/wix?keyword=trb+2020+program', suggesting a phishing or content-luring scheme. The PDF structure also indicates a link farm, further supporting the malicious purpose of directing users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/wix?keyword=trb+2020+program
    • http://hurleyshamburgers.com/90_s_music_grungeoquc1.pdf
    • https://static.s123-cdn-static.com/uploads/4389816/normal_5fdc9641eeb0d.pdf
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/dusowovux.pdf
    • http://garderob-podolsk.ru/diary_of_a_wimpy_kid_long_haul_full_moviexgt3l.pdf
    • http://housefashion.ru/hindi_alphabet_matching_worksheetsc27fo.pdf
    • https://fegafedanopi.weebly.com/uploads/1/3/4/3/134311678/4892a.pdf
    • http://twitter-center.com/webasto_heater_air_top_2000_st_manual59ruj.pdf
    • http://itawegan.space/bill_nye_rocks_and_minerals_worksheetdo1pz.pdf
    • https://static.s123-cdn-static.com/uploads/4383571/normal_60079ee760647.pdf
    • https://cdn-cms.f-static.net/uploads/4475992/normal_6057b2bd2015a.pdf
    • https://ledugatikafaf.weebly.com/uploads/1/3/4/6/134693541/begataf.pdf
    • https://cdn-cms.f-static.net/uploads/4465264/normal_601830ff45fcc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/leributafa/xaseboduzelubitegiwezo.pdf
    • https://s3.amazonaws.com/kosipefojaw/bawevinale.pdf
    • https://s3.amazonaws.com/gasodamuza/rewepirunonubinivu.pdf
    • https://s3.amazonaws.com/waduzirader/cellarmanship_patrick_o_neill.pdf
    • https://s3.amazonaws.com/luworizesupox/fotelejifep.pdf
    • https://s3.amazonaws.com/vixuwogetiv/11618717173.pdf
    • https://s3.amazonaws.com/zopenave/roroperopisetajisen.pdf
    • https://s3.amazonaws.com/widiku/how_much_does_it_cost_to_fix_apple_screen.pdf
    • https://s3.amazonaws.com/jedadokuti/latest_samsung_android_phones_under_15000.pdf
    • https://s3.amazonaws.com/sazomo/kuzobifusokeguxutejoratu.pdf
    • https://s3.amazonaws.com/xupovobejanam/fundamentals_of_human_resource_management_7th_edition_ebook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcad.bin
60ca6c6036cd59e408c0750645da11f1d5a3279de69f7b527151de5f13aef7f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 4728 bytes
font_01_sfnt_off0000eca2.bin
ce677031dbad48eac74f28063e19deebc1f22bd15270d401b88a62428f1100ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 10528 bytes
font_02_sfnt_off000110c3.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 4324 bytes