Malicious PDF — malware analysis report

Static analysis result for SHA-256 718bfbae54a18578…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 10:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4fcd730aa530e675b2c08d2ca23101c SHA-1: 42dd7b714284b958e2c08a17bef3abd6cfdb7bc1 SHA-256: 718bfbae54a18578af6da227bfa59442fd25f5e1a4335820cfa0f05b52c97116
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://makiriaszto.hu/ckfinder/userfiles/files/dorisonajejekaguwedonineb.pdf In PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/62234549078.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/63183229426.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/54939987951.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109061611303303.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/76878009304.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/xuxapoje.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630696471/file/80820864622.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/78719676113.pdfIn PDF document text
    • http://word.mn/uploads/assets/54935904145.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/72469755003.pdfIn PDF document text
    • http://tencanpowder.com/d/files/vajepesubarizil.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/nibemotowedinavulanur.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090620055173499.pdfIn PDF document text
    • https://majubesar.info/contents/files/41875338217.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/62475644113.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/97631758661.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210909_A82CF8B33BF31131.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/60124264120.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/85283879016.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/577346757.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/1696707601.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ffddo5hbn0ascpmct32dikbe3j/wekeguvaxomuximet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=my+uncle+oswald+pdfPDF 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_off0000d3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 10616 bytes
SHA-256: 4c4b1c66293e5802c63d4eefff5b15ed039e213ea0f4fecc90c3b45287b3fb1d
font_01_sfnt_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 18892 bytes
SHA-256: 730dbd85ba07a88b0f29651809843cd31304e5b90c332b5d585d9bd6d65794e2
font_02_sfnt_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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