Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacc8030335cf74b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 21:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3ffcfd264ec4acf64c982545d76e425 SHA-1: 5a37820ef03f4cf8d1d3487067a23547150593ce SHA-256: bacc8030335cf74b4dc08b5dba8193fe27bde2d393459f726fe243b16853931d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm designed to deceive users. The presence of a 'download button' heuristic further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://giprozdraw.ru/ckfinder/userfiles/files/74626966995.pdf In PDF document text
    • http://finchamauto.com/pics/10932622294.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/59481392016.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/pomabo.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/88406551505.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/sokibibaminemorotij.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/83922572983.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/negadikudot.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/lunomeberutupafabowesa.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210918033547_1543866418.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/50071347797.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/47283846626.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109132100477869.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/49098053371.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/37107308815.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/pazufakexu.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/labifiduvexaduvukekagut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=transfer+files+to+smart+tvPDF link annotation
    • 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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 17936 bytes
SHA-256: 0d52b4a865fc81dd8930a32df2c7cf425a560b75d555099ab7c6d176a90c3152
font_02_sfnt_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 10404 bytes
SHA-256: a75850f0c27a29596dc72beba0be3aa41fa3544c7022812aea985254c840afb1

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