Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7bc262e32ed189…

MALICIOUS

PDF

77.1 KB Created: 2021-03-11 02:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1b8a0d0fb7aa897771e47ec5791fdc1 SHA-1: 68cff51ff2559f8dfa2f97d157d7968ab70b9621 SHA-256: 9f7bc262e32ed1893c26b78e89e6628930ed27e2baa48673dce1a32d805f9f37
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to unknown or potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=al+anon+12+steps+12+traditions+pdf
    • http://kernig.store/i_love_you_stinky_face_wordso7fur.pdf
    • http://frukt.space/xakatelavesolimutifowifz9l4y.pdf
    • https://cdn.sqhk.co/dibitarebizu/ghw4jiy/sniper_assault_captain_mod_apk.pdf
    • http://lojapidabud.mypressonline.com/mountain_america_credit_union_promo_code.pdf
    • http://domsale.xyz/247216643207dpuk.pdf
    • https://cdn.sqhk.co/noluxokeruma/hjghzcq/rusowubutupirokemizupe.pdf
    • https://cdn.sqhk.co/mugapowejog/fgdihi0/tia_brain_train_program_in_chennai.pdf
    • https://cdn.sqhk.co/fukafodifi/qjagifN/bass_booster_for_pc_free_download.pdf
    • https://satisetuxa.weebly.com/uploads/1/3/0/8/130813646/7982479.pdf
    • https://cdn.sqhk.co/sanevujaguda/jbYqW3g/snowflake_ipo_price_date.pdf
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/lefiromogusinesa.pdf
    • https://bilagezapa.weebly.com/uploads/1/3/1/1/131163658/0487f07b28841.pdf
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/8514392.pdf
    • http://jisetatiloro.scienceontheweb.net/what_does_the_term_blue_falcon_mean.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_f7165328bc494d5e8441b961f01f9e28.pdf?index=true
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_6a003e8c070e43dea98e0aed6921df6f.pdf?index=true
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_892d0f62168545cdaa5d34308d357c54.pdf?index=true
    • http://gosaduzunake.myartsonline.com/xunovugizutimek.pdf
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_7a70176753644097857a5764ad1b995d.pdf?index=true
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_7029932a113149e097b1472db4885f2d.pdf?index=true
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_2b00f37f8e704c5eb870ad7290d2a36e.pdf?index=true
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_8f7f9a437039443d92a13e2395e534e5.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_off0000f06e.bin
af0d382d85b9b0823278a42e8c723771d404e3c221a7c2cafc31313e1bfda4ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 5208 bytes
font_01_sfnt_off00010239.bin
e4ca373ceb9e50e38d1e5befb84df5d99b1e5252651f0706f8db451863a3f5dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 10768 bytes

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