Malicious PDF — malware analysis report

Static analysis result for SHA-256 854ecbe2307544c7…

MALICIOUS

PDF

84.2 KB Created: 2021-10-08 06:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3ae31f79416ee74590482819b7d7bf6d SHA-1: 6f2833c533de64c9bda42b5af72aab3dd1caff19 SHA-256: 854ecbe2307544c7272be6ab33c7b0382706bb74a6589ce45b2e94a93d269a2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious content, and the PDF structure suggests it's acting as a link farm. While no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, and the presence of external links suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://studioguatta.it/userfiles/files/83538904351.pdf In PDF document text
    • http://bebelino.ru/userfiles/file/18514942110.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/64688784452.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/giwegomejitolevimulumab.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/nesojuvodepunemoxomuris.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/xodajomalofuwakanosawoso.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/50678756964.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/lazixavigemodugenika.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/73787970451.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/fupusovulimikugarewun.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/xoxanefupawibodatemezaji.pdfIn PDF document text
    • https://naves.cz/res/file/22701823458.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/5023749183.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/21246128132.pdfIn PDF document text
    • http://scarpatti.com/files/1692707485.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/zekosoxexifo.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/65721921439.pdfIn PDF document text
    • https://seger.cz/userfiles/file/tunijesezokugaxupopeziro.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/buvezoj.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210924101432_yrsxfz.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4318cf75fce1b18c194788230b585c8a/xupezofibujipu.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/mulexifiluxafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=math+graphing+websitePDF 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_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 18172 bytes
SHA-256: 1f0b3ebc90aca0e2c11aec5ec37c01dd3c3e64238d51a42de6ff189ab09b49b9
font_01_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 10584 bytes
SHA-256: 9a4c9f5dfb63b3c4cb3c4bd4b1b73c56c3a778eec38bc42b5fa6ccacde6a2f60
font_02_sfnt_off00012b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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