Malicious PDF — malware analysis report

Static analysis result for SHA-256 638848c1383d68ad…

MALICIOUS

PDF

76.2 KB Created: 2021-03-24 10:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c19d91b0e86176980d34b78e18e1bb5d SHA-1: 8b5d83e71a8035822a2098163785661c89734895 SHA-256: 638848c1383d68ad21321ed3987e948f5f6ab4d654161b586735bb0a18eb5d83
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/award?keyword=estadistica+para+negocios+y+economia+anderson+12+edicion+pdf+solucionario
    • https://cdn.sqhk.co/lebapivi/dXt8BJJ/assistant_manager_salary_walmart_california.pdf
    • https://cdn.sqhk.co/tawibonikigo/FgjNWgd/70097151738.pdf
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/koverakurenov.pdf
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/2568819.pdf
    • https://cdn.sqhk.co/mugetawelumi/vha2cea/89851164687.pdf
    • https://cdn.sqhk.co/podadoxafa/ysjihgZ/bernie_sanders_2020_platform.pdf
    • https://cdn.sqhk.co/foxinukepo/jhijcji/moberepedigo.pdf
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/12ac0.pdf
    • https://pobanuti.weebly.com/uploads/1/3/1/4/131437932/1736546.pdf
    • https://cdn.sqhk.co/lobinazema/igjbjen/wejedekesuderuvunufinuji.pdf
    • https://dutegonuguval.weebly.com/uploads/1/3/4/3/134310875/b436bc76.pdf
    • https://rititebavoxufi.weebly.com/uploads/1/3/4/7/134705535/dagab-mogedatejid-gexuf-wiketakenizewu.pdf
    • https://cdn.sqhk.co/depadukat/cfXidib/puppy_dog_images_hd_wallpaper.pdf
    • https://sutivekawexebe.weebly.com/uploads/1/3/1/6/131636655/kunon.pdf
    • https://cdn.sqhk.co/damapegapi/QWeCgcl/14169954202.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_c23692c4a9ff4bfb8caa21fa0a84f71c.pdf?index=true
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_f4aa2687eab34dadb3968a6b5a4c908a.pdf?index=true
    • https://s3.amazonaws.com/kumasala/52913862982.pdf
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_5995c16269da495ead7c60f22f0cd9e3.pdf?index=true
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_2bb5a11f90b741c18cc5ca1d703842c2.pdf?index=true
    • https://s3.amazonaws.com/xiwevitox/33605370332.pdf
    • https://s3.amazonaws.com/xotomisen/professional_azure_sql_database_administration.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d466.bin
2cd5f4cbcd2e76e24bd4aaf959f24ab3f8f9b71e5380c84d7745c77c78e597f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 5716 bytes
font_01_sfnt_off0000e7e1.bin
e762f8512fd9559a8d6c0114cb54b20ec0b756848fe7e5a033f55d61bc4f854e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 11120 bytes
font_02_sfnt_off00010cf5.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 16204 bytes

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