Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e07c44b9751e8f8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 11:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d45d078d38c3600ad9318a924c017a3a SHA-1: 4b57b0bb4ccde4a1aff4297b06e9f943981ba854 SHA-256: 1e07c44b9751e8f88230498a9385459240f935d2417c239177223b6947c8b243
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URLs, many hosted on disposable domains, suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://catamma.ru/uplcv?utm_term=touch+vpn+free+unlimited+vpn+proxy PDF link annotation
    • http://hoteldanang.vn/uploads/images/files/nawofelutabojukewo.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/zasoxololop.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/239773785.pdfIn PDF document text
    • http://change4best.ru/upload/file/nuwovokonubasolulele.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109031856137889.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/todetusigekupadugena.pdfIn PDF document text
    • http://panova-art.com/files/file/fatemosad.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/dafiparefawuwi.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/wosusidolebagolapatud.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/vuxisojigufaf.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/detixomasagivigakusud.pdfIn PDF document text
    • http://podarox.ru/public/files/nelulosiwatakuzin.pdfIn PDF document text
    • http://erimti.com/userfiles/file/jesokoxexakopafurevogu.pdfIn PDF document text
    • http://househouse.it/userfiles/files/80759439563.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/tiwatenidoleza.pdfIn PDF document text
    • http://abwrva.com/uploads/files/1526551547.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/4893246813.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/miteloxewa.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210909_052139.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b8683cff3a86fd2ee3706301084b519e/91450353448.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/mebovexuwozuvamef.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2aec738c---toripivejojibol.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210907_090615.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_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 20580 bytes
SHA-256: 5e2ba58f30ffffb16d7da8ac43fcc97342d4ed663b756360e031e03f246dcc2d
font_01_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 10900 bytes
SHA-256: 0f00e8f91db091371123d260aaeb043cf71bab02c37a7125c29aa72e082e5c06
font_02_sfnt_off0001292e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1