Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1ae0f8bac37779…

MALICIOUS

PDF

88.3 KB Created: 2021-10-23 04:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 28eaace01f8d0b696d75e81a0e1cac06 SHA-1: 96954a2a70a9a389fa3eafb7fdc8a46bddf23706 SHA-256: ff1ae0f8bac3777932d971cb8689290183b4759a1f44d6c47ed54d31836bd670
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to obscure the final destination. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://mislenyiallatorvos.hu/userfiles/file/gavejewep.pdf In PDF document text
    • https://khangle.vn/uploads/images/files/39690258818.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/fekuvosopiwugax.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/loxexadaxupukux.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20211014142356.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20211010083106.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/razomej.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/55840648204.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1616d908a917cf---xixejamodemeribova.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/movapokalukonijovirida.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/34c33dc9687ef21c0983ee1691775232/23129966070.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/26759497250.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/sujokerivasonugijegilok.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/favunagazofobitijuxoz.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/tavune.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/sifilubowafijojexiwap.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/45881368111.pdfIn PDF document text
    • https://cserepakciok.hu/xdata/file/47177149428.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/90435254188.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/60589425413.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/jiweduvi.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/71793246792.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/31522792443.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/77833379752.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/67792769521.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/2I9n2o-U8HI/uplcv?utm_term=income+survey+question+examplePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 17688 bytes
SHA-256: 3ab337948fcd2498621d55d3296299db3a3f7a45d48d6298de6f7d91fd6625dd
font_02_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 11016 bytes
SHA-256: 2440e2053df3d8cdfe37fe294673a572e760834315905dacaf77fa5277cba4f4
font_03_sfnt_off00013ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA2 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae