Malicious PDF — malware analysis report

Static analysis result for SHA-256 72459014714b28f8…

MALICIOUS

PDF

76.2 KB Created: 2021-04-05 02:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f949df9f1479e63bcb609bc1780b73c SHA-1: dd8a8f061cf8930f5b49b5753e5aa18aaec4062c SHA-256: 72459014714b28f8b24c9d4de1568e616b18f95e10a6d71943591f1bf5afa028
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as search results for educational content. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to direct users to malicious websites or to manipulate search engine rankings. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=anatomy+nervous+system+test+questions+pdf
    • https://cdn-cms.f-static.net/uploads/4459328/normal_602ce5e7d0a65.pdf
    • http://zitirisiz.mywebcommunity.org/5858292859.pdf
    • https://cdn.sqhk.co/gawagunikuw/Sjhrigc/ballroom_dancing_competition_youtube.pdf
    • https://cdn-cms.f-static.net/uploads/4466151/normal_606382199e83e.pdf
    • http://libopadu.scienceontheweb.net/44936853254.pdf
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/bujisedujagosa-fafebisizu-webuzona-pobolexumaxulus.pdf
    • https://static.s123-cdn-static.com/uploads/4460982/normal_5fff4add109cd.pdf
    • https://cdn-cms.f-static.net/uploads/4417029/normal_604192446fb4e.pdf
    • http://jilavixit.medianewsonline.com/environmental_impact_assessment_case_study_examples_in_india.pdf
    • https://butadopol.weebly.com/uploads/1/3/1/3/131378795/dotutoxetez.pdf
    • https://cdn.sqhk.co/rufebumu/cZOtdYp/79646377883.pdf
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/4d7524f726.pdf
    • https://cdn.sqhk.co/nulaliki/egeD2jg/8742586008.pdf
    • https://cdn.sqhk.co/bamazaludez/bI1ijgc/zombie_wallpaper_iphone_6s_hd.pdf
    • http://kepukarob.sportsontheweb.net/lafulugulikaweruroluxibaz.pdf
    • https://cdn-cms.f-static.net/uploads/4467027/normal_60145f1f5d93f.pdf
    • http://gaximivotekole.mypressonline.com/jidatuvogozarunomel.pdf
    • https://cdn-cms.f-static.net/uploads/4499283/normal_5fe7d2e7f1422.pdf
    • https://cdn-cms.f-static.net/uploads/4446496/normal_604f7889f1eac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_fdf0c84200974e78b03961ba039a93a3.pdf?index=true
    • https://a49ec80b-b4e3-4dac-84ed-d687b6aff6a5.filesusr.com/ugd/46d696_ded652abd63f4b67b5b72d456ed1a11e.pdf?index=true
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_79ca6476bced4882b1c48c63d1dd9eee.pdf?index=true
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_03c10ee5bb47435383c19877ee2ad665.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5e.bin
663346570977a5fb71ddbcb589bf75a5b0f11d56cc15fdf2be6232e8685c6abd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 5432 bytes
font_01_sfnt_off0000fecd.bin
d80f0a65c631a9cdffea482f7a5960a0f9536d24b0c25862c2be2f990f0396b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 10760 bytes

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