Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f80f74e40940d7d…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 17:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a9b7d4e2d69eace6031443026dd9d7f7 SHA-1: 8e8c3be56ece18afe91199ccaffe7ff196cb3ff7 SHA-256: 6f80f74e40940d7dfd32db0ce9d421961b0233e1b9f16538e09d8afb541ea8d8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link, a common tactic for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially malicious URLs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://tydafa.com/dafa/uploadfiles/20210926165850.pdf In PDF document text
    • http://lex.tj/img/file/58900636826.pdfIn PDF document text
    • https://tele-video.ru/upload/files/gowegofarodabonog.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/ziboxuwuwo.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/39773490060.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/dupolu.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/85356725517.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/90405910516.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c22f237bc4---19907608224.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/df8e6e17502833bee8d23f963048f27d/sujogubabem.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/21519249879.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/gejuponubipafiroxo.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/tigepesowifejipo.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/25811301979.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/vofipimozodexoradagudovo.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/zezipujesixomeku.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/kexojoragigigo.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/27495138952.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/11235040602.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/7682494797.pdfIn PDF document text
    • https://labelmarket.pl/data/file/rukejokevobifijuzo.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/91257442142.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/zotodiguravidatufabikira.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/31984261098.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/16338684614.pdfIn PDF document text
    • http://sangiaodichlaocai.com/upload/image/file/tuzomukewevafivow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what%27s+the+logo+game+answersPDF 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_off0000b346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB346 14264 bytes
SHA-256: 90e4bfbe833e1e5238e026707de3e4d5a2dbd4f1519858fd3ee142dad422f394
font_01_sfnt_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 10576 bytes
SHA-256: 20fa86a4c46e01765715a27a6ff0e01b760844c6c72e64c99200326845d4f8f4