Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5aaeab03dc9183…

MALICIOUS

PDF

68.1 KB Created: 2021-10-04 04:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bd006987971f64c09728595fc80d3444 SHA-1: f9db39c3603ad58c13661e34c94840af4c47322a SHA-256: dd5aaeab03dc91836c54436426bf604e5626ab6bace3d490af46bf3dd494b569
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains and presented as a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=solubility+of+hydrocarbons+in+water PDF link annotation
    • https://livewireeventz.com/userfiles/file/89219015671.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/64875010956.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/54270300643.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630861209.pdfIn PDF document text
    • http://lulanjina.net/upload/files/40879417250.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/zufutokujujoweku.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/25423129879.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/90aba138408bfa72181def29ff395e1f/zikab.pdfIn PDF document text
    • http://stevis.cz/files/file/9575028765.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156a376af646---55059567661.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/89667055541.pdfIn PDF document text
    • https://mkontakt.com/dat/file/57004999796.pdfIn PDF document text
    • http://orenprom.com/img/account/file/doxuresifituferubozoxejo.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210924121036137971.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/tubuwug.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/pamoxojosesizi.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/xetogemoduritilekeledudo.pdfIn PDF document text
    • https://n-tlg.com/files/file/farel.pdfIn PDF document text
    • https://magerp.org/upload/files/36106661712.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/50539304191.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/16282717287.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB78 14900 bytes
SHA-256: 2c84f7bb9c483a10be00f1a0b7222feced4c66760327b043441ffa07981aa440
font_01_sfnt_off0000d12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12D 11088 bytes
SHA-256: d81d9f16e2cbbe14698a6b4762f3e1a9822910f7c94534ed14444dfdb649a7a1
font_02_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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