Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44d88239c24089c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-20 02:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b55eeb067286403e7e3dc067c0b9e22d SHA-1: c0decad7c27eb37347c7660b27f48aae4e430b51 SHA-256: a44d88239c24089cc31004e43e3442d023fb05f9eb3009f0b6921a3a724b7f1d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to distribute potentially malicious content. The primary malicious URL identified is 'https://soxebez.ru/wix?keyword=free+movie+apk+reddit', which is presented as a lure for free movie APKs. ClamAV detection and ML classification strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://soxebez.ru/wix?keyword=free+movie+apk+reddit PDF link annotation
    • https://cdn.sqhk.co/mimufedu/dlUAwG1/space_stg_3_galactic_strategy_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/jhbhfja/video_downloader_for_instagram_iphone_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_405b3ffb00ef4a20a5bc6863e7626712.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_a5b2c447a8f64824bb4d74db2d2702b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/70971081396.pdfIn PDF document text
    • http://runuvezufonesex.rf.gd/rolawetukuxefidagixi.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/2010_camaro_ss_front_bumper_painted.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/fighter_jet_paper_airplane_templates.pdfIn PDF document text
    • http://bafasoronejero.epizy.com/wumerilefok.pdfIn PDF document text
    • https://ed8cecbe-9888-40ab-9384-4b5b2efda5e6.filesusr.com/ugd/22dd42_04939795c523402db329fe683c946fe3.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_985cfef246614f60828ca44de258e656.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falufusu/98993187173.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/msi_970a-g46_ms-7693_manual.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_9b3843a46055426cad9e098473f0c410.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/american_pie_band_camp_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/double_bollinger_bands_trading_strategy.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_e504a31a9403443f82c628d9522b968a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobito/honeywell_chronotherm_iv_user_manual_english.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_258748b9ffbb42c6bb208c696db6c5b0.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_4615c5d582114dc58ac83ac441120872.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_db429b5466b84c11a38303d6dfe2e1f4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 4972 bytes
SHA-256: d34601d9499e6951841f879851a8228874d2c84ea5b6b6f151024c4959cd5f75
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 10408 bytes
SHA-256: 73478fa2d599a869779fca2aba55868a2a59f69ae9b3014f8caec38e242288a5