Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c33ee83e93b315…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 18:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58931f0e400db9c7f4ea77a94765e91f SHA-1: 559c55929ebbf5cc3e1b1d3d1a3187a51ea691d3 SHA-256: b1c33ee83e93b315bd3792440a5255b9d60be020e16dcfc7d23167abc8360ee3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and exhibits characteristics of a link farm designed to redirect users. The presence of an IP address literal in a URI further suggests an attempt to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to lead users to malicious content, likely phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mbjarrahi.com/UploadedFiles/New/file/81800399661.pdf In PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/subikemoj.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/74949379312.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5099887605.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/2763029418.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210921_40B8118B530530A9.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210917105425700.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/bidepebupas.pdfIn PDF document text
    • https://bem-sa.com/img/file/sisizewonodazesafid.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/parerovo.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/77155629615.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/50080245777.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/xiwesizupekajaxipito.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/81625533169.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210902172608.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/goxopoju.pdfIn PDF document text
    • http://goref.ru/files/file/74340615603.pdfIn PDF document text
    • http://kaies.net/upfiles/210908191228293712zeyjax.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109091815237561.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/zinewisupufaxizawoso.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210910_065436.pdfPDF link annotation
    • https://mokshadhamnepal.org/userfiles/files/fusizezumumefigatagam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fifty+shades+of+grey+full+movie+torrentPDF 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_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 11060 bytes
SHA-256: 934a87318a8c73174ca66386803e634338d7f6ff5b423b74d8f264f9e4b51d94
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 17992 bytes
SHA-256: 60b97789666fbbcf06d9f799458ed01fa8cc698fdb858bacd3aa1e263a3afc9e
font_02_sfnt_off00012b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1