Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f39dc755887fb99…

MALICIOUS

PDF

76.0 KB Created: 2021-04-03 21:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 27bee1594a33a8a92600edc6164186c6 SHA-1: 5b85613552f995abcd940c44afea4ebf1b88f71d SHA-256: 9f39dc755887fb990b89f4621627c05a37a0475464066dbdf487e3401cd853ae
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely phishing or malware distribution. The PDF_URI heuristic specifically highlights a URL designed to appear as a search result for 'alcoholismo en bolivia pdf', suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=alcoholismo+en+bolivia+pdf PDF link annotation
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/f6321558ee1.pdfIn PDF document text
    • http://carishr.com/infrastructure_development_in_south_africaxd0uy.pdfIn PDF document text
    • http://steelsho1.club/big_data_hadoop_book52vf3.pdfIn PDF document text
    • http://8gusevshop.website/ancients_reborn_fishing_guidelg5d2.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/autodesk_inventor_tutorials.pdfIn PDF document text
    • https://lisevududotuwak.weebly.com/uploads/1/3/4/2/134265384/5e0590.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/Rq2hhij/instagram_story_viewer_list_greyed_out.pdfIn PDF document text
    • http://my-favshopd.online/what_does_the_ending_of_maze_runner_death_cure_mean6k2hb.pdfIn PDF document text
    • https://cdn.sqhk.co/vexapalas/aiihjnl/project_planner_template_in_excel.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/screenplay_dx_hd_media_player_1tbhks2q.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/edhbjdl/marketing_mix_strategy_example.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuroli/exbujj8/nonaso.pdfIn PDF document text
    • https://dobuwejakunarek.weebly.com/uploads/1/3/4/7/134772316/bcff47.pdfIn PDF document text
    • http://contarinihome.com/windows_server_2012_r2_iso_activation_keyueutw.pdfIn PDF document text
    • http://matras-24.ru/backup_android_app_data_to_google_drivekigt0.pdfIn PDF document text
    • http://prizinsta.site/82374558721d8rhh.pdfIn PDF document text
    • http://copyrighthelpcentral.com/bojangles_calories_chicken_biscuitvk4w1.pdfIn PDF document text
    • http://100p-f.ru/nesasopovenitovixvd.pdfIn PDF document text
    • http://ideaita.fun/petit_prince_chapter_10_summary28uqa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubaragete.rf.gd/antimalarial_drugs_list.pdfIn PDF document text
    • http://tigaxulajaju.epizy.com/how_to_jumpstart_weight_loss_after_60.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_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 5488 bytes
SHA-256: c3e83f046b357c5b25ea6ffac9124694a9aea937a39279add7b4893506361576
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 11900 bytes
SHA-256: 08dc98cae882c71088f42d339836b755e44c4a8a57a105ee4495eef271986f95

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