Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa78a0dc63807e6…

MALICIOUS

PDF

85.7 KB Created: 2021-10-15 20:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ab60a7889fa6dfc02bb1516ab1d28df6 SHA-1: bd9babd7e0991bf2440d42db3cc42be92afed72f SHA-256: faa78a0dc63807e6c47566c444891e061afde792066a4c60c644d62db123d175
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous links to disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs point towards an attack pattern involving user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://moyaexpresss.com/ckfinder/userfiles/files/87825899092.pdf In PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/xegobex.pdfIn PDF document text
    • https://webhosting4.net/media/file/98628427500.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/jemofuzenuzakubaze.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630764812.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/munebeduwolenorexo.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/tupoxikexudirowulefo.pdfIn PDF document text
    • http://teraval.cz/res/file/ragiriwirulugugesesuso.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/memarikarobokuzezorivi.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/raruvebevuvozugil.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/43116215119.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/wisoxodagezu.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/lelegime.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/54616877137.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/86339951370.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161620e3303909---14478422013.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20211015734404624.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/63404ae66e7b56bec5e1644659e23495/30624115936.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/satitijenide.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41348213612.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/63437028967.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/gokedisojetaxis.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/91811225897.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/sobubesuzej.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=subset+of+finite+set+is+finitePDF 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_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 10216 bytes
SHA-256: 63479e97ed0d88e275ed1c051e2281b7156c9dec622b5fbda3d83998dbaeb378
font_01_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 20844 bytes
SHA-256: 33adc3db5b5f8bd08779d0a96a1f9e1e1d96850729f0260d538efb2130073538
font_02_sfnt_off000130e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1