Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6aa52905830be3e…

MALICIOUS

PDF

75.7 KB Created: 2021-03-06 06:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 851bdf898c3e033d444b277d1ff55e80 SHA-1: d7b7b21d0aab58a299ab012e2c6c076a66038c50 SHA-256: b6aa52905830be3e26a731faade47670ed28a59f89c6c0d2c93738608cbfe701
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=how+to+make+tartine+country+bread PDF link annotation
    • http://macsk.space/epson_home_cinema_3020_overheating4ns8k.pdfIn PDF document text
    • http://artelamp.store/2323573485ulmo5.pdfIn PDF document text
    • http://creditreportus.info/sun_tracker_pontoon_boats_for_sale_in_texas4vs76.pdfIn PDF document text
    • http://3203epworthcres.com/tigurejejuriwasunojafwj3hj.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuzijix/hg8ihhj/defense_zone_3_ultra_hd_pc_cheat.pdfIn PDF document text
    • http://rfs.team/gta_vice_city_kurtlar_vadisi_full_indir_salam_indir12n33.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/jajjmij/linelamipuwij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474989/normal_6029ce4fa1452.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/56209544817.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416316/normal_5fc9a2a581635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_601911d41b3e1.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/wameferajuroxadup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3699e67-c4ac-4232-8e3c-382b8f5ca60e/69133749311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f03b66-9716-4033-847c-b1120bff9e47/whats_in_dunkin_donuts_hash_browns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ec9933-745c-45c0-930b-758c25c9d476/what_does_the_tip_of_the_iceberg_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc40a3ae-f083-4e4f-bd2b-79c19983d19c/lateral_thinking_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54786951-afc2-42a8-b41e-97bc9f5f773a/hp_easy_scan_not_working_flatbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f7b931-1631-45e7-80e0-acb50000dbc1/59520168909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2ad43d-b74d-430f-84e0-ede838c1ce06/jugixikitijajomaz.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_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 5232 bytes
SHA-256: 50603b216bbe69d5c33cdcf2790fd8e4ad5631673755b8e6bdac9fdcf3d7d4da
font_01_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 10080 bytes
SHA-256: 933772d6c4657b8be17c103252c21e6e84ee73ff1643a20031eff8c49192669d

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