Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa67dce5e687c57b…

MALICIOUS

PDF

82.5 KB Created: 2021-03-08 18:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 642af086cca702ea7b0ebcfafb1cae6a SHA-1: 34ec7ae86cb17c9ae08595d201434a37190832ba SHA-256: aa67dce5e687c57be0b26b355913c5cb319e55ccb6dc9e8d9da61f64a0be0c6f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/strik?utm_term=how+to+run+bosch+dishwasher+silence+plus+44+dba PDF link annotation
    • https://cdn.sqhk.co/fakosopalo/icOjbji/best_colouring_pages_for_adults.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529977/normal_603a0e336a5f5.pdfIn PDF document text
    • http://re-prime.ru/which_of_the_following_accounts_is_a_plant_assets_categoryv2el0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_601671106d49c.pdfIn PDF document text
    • http://zajifokabatu.iblogger.org/florence_scovel_shinn_espaol.pdfIn PDF document text
    • http://stingeksoj.online/hmrc_cumbernauld_telephonexxkex.pdfIn PDF document text
    • http://itawegan.fun/14649206224xddrw.pdfIn PDF document text
    • http://hookup154.fun/is_nano3_a_strong_or_weak_electrolytemw36v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_60342203a56e4.pdfIn PDF document text
    • http://retys.space/efectos_secundarios_dela_metformina_850_mgft7nv.pdfIn PDF document text
    • http://dostafood.xyz/27277828133nyop.pdfIn PDF document text
    • http://merekidade.22web.org/2085596531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_60334589172b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479938/normal_5ff442990e925.pdfIn PDF document text
    • http://msertis.xyz/what_are_the_drill_commandstbn16.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/5Ehiiiy/earthquake_bay_area.pdfIn PDF document text
    • http://souve.me/how_to_set_up_dymo_labelwriter_4xl_on_maca26co.pdfIn PDF document text
    • http://it50discount.pro/basara_4_ps3nyot9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fotepopunaj/58090467426.pdfIn PDF document text
    • http://wabifitas.epizy.com/how_to_change_battery_in_chamberlain_garage_door_opener_keypad.pdfIn PDF document text
    • http://jigosip.epizy.com/28211701363.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/verb_tenses_worksheet_year_3.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/cabal_europe_free.pdfIn PDF document text
    • http://sibijexobesu.epizy.com/70508010114.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 5324 bytes
SHA-256: 99ad86f541435eaebc63498a9c6be0a4be657b72e66256f29f7a66a6a522d2e6
font_01_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 10504 bytes
SHA-256: 3d9751ccf042f74e0092605b3b07ac0d1353acc6f8a653a1c2205a26c6631661
font_02_sfnt_off00012d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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