Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05548eb0a884e27…

MALICIOUS

PDF

75.3 KB Created: 2021-03-25 12:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9d704e6804fa213616348aaa0ecfa58c SHA-1: 5866b0c4acfe2042fcaf9db4d18310a54d9bda95 SHA-256: a05548eb0a884e271353433db0654164c0b2309c23cf0f6617a22af69be1e67e
186 Risk Score

Malware Insights

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

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 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://resalured.ru/award?keyword=dracula+oxford+bookworms+stage+2+pdf PDF link annotation
    • https://cdn.sqhk.co/nukusigemug/h6whiib/navumumetipaxupinefojel.pdfIn PDF document text
    • http://hotsales-com.xyz/mathematics_textbook_grade_10_12_download90otb.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/i78QRij/steven_universe_quizzes.pdfIn PDF document text
    • https://cdn.sqhk.co/xifobariw/fsFwhjC/cinema_4d_ly._ir.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/bhgegfC/foxatobewo.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/cidgd6K/yellow_finch_bird_symbolism.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/work_energy_power_practice_problemsdcdo3.pdfIn PDF document text
    • http://douchehq.xyz/misal_romano_1962_espaol-latinoi6lp2.pdfIn PDF document text
    • http://tublitalia.fun/49660416098s3d0a.pdfIn PDF document text
    • https://cdn.sqhk.co/wedowetaso/fjbxsja/how_to_view_my_icloud_pictures_on_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/hjFYpgi/71356724935.pdfIn PDF document text
    • http://sifuzifixezija.medianewsonline.com/jejifepofupisiroz.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/ibFjjzd/30494411901.pdfIn PDF document text
    • https://cdn.sqhk.co/toriwogadej/ficvrWC/android_box_best_buy_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/40Xaici/music_video_editor_apk.pdfIn PDF document text
    • http://testvvd.xyz/guidesman_flashlight_1000_lumensk5k1j.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://d74058ad-8c31-4576-aeb4-582a73b10e1e.filesusr.com/ugd/666c83_d7823874ea08485e9a7b7c19aa92fbdb.pdf?index=trueIn PDF document text
    • http://filosoko.onlinewebshop.net/modal_verbs_rules_and_examples.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/xixumipi.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/99489424965.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/ejercicios_de_porcentajes.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_ce58dc1696aa49519a2e4fcb8dcc03b5.pdf?index=trueIn PDF document text
    • https://4f0f5a39-0a2f-4cdf-b4e4-40a644fad8b9.filesusr.com/ugd/2024fe_7290b2df764d42eb82e3a53b56d12e0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/76698932362.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/xexosofufukusug.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_1b2d1e6b67f24369aadaa09ec518c222.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_19f5f39828344dbaaf2eb59c31af1084.pdf?index=trueIn 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_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 5700 bytes
SHA-256: 1f7d9f2e8d86b211294267c8b6b1e3eaccfadca36bce4a62d15adf64009dd13b
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 10800 bytes
SHA-256: df5e4b6b2beba608815a948ca1c461a4ee8338466ae59fc67880d61d66fbcc5d
font_02_sfnt_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f