Malicious PDF — malware analysis report

Static analysis result for SHA-256 7629bcc146399a33…

MALICIOUS

PDF

75.6 KB Created: 2021-09-15 18:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a97a444452d6a0c8a4f02039f5925653 SHA-1: 0edce847f0f4abb8b9ea904de46ec9d7614bc49c SHA-256: 7629bcc146399a33db776c51c3c60a458a58a507c17aabc1179e6f5dd6adc747
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous embedded URLs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=hacksaw+ridge+full+movie+malay+sub PDF link annotation
    • https://brianhigbielaw.com/UserFiles/file/94434565100.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/gavafenebudunafa.pdfIn PDF document text
    • https://aromamarketing.md/img/files/56810183963.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/menexowagefuzokupesabipo.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/sabepasafokasowolemaje.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/xajebusiki.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/kelawunexobag.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210906_D2450644337165E7.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///31114660576.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/wedajibajowelodiketi.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/4582388981.pdfIn PDF document text
    • https://dukupahit.com/contents/files/nuwakadaruxusujojalad.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/80184808499.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/58047451687.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614031b372ddb---sekitaferiku.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/p2ifutbplqjg4hbctcl6oi13om/51612718039.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/texanoxudawalewatadokokok.pdfIn PDF document text
    • http://fitviewer.biz/files/file/69716446821.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/30386247844.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/bibododok.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/78445436192.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/91427156737.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/zepesoluvupipozudeta.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0451268001630670193.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_off0000c311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 16704 bytes
SHA-256: 635d5a2ac3498988d6cc2fc9bd4211f03a038f072dff9f72197142b6411e82ec
font_02_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 11204 bytes
SHA-256: 71cb73bcf46ed8eff7c9398aeb3f9c1d11f921d1ca4e61348692ec7897df7bbc