Malicious PDF — malware analysis report

Static analysis result for SHA-256 2471f85da0dbfada…

MALICIOUS

PDF

97.0 KB Created: 2021-09-13 23:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a08c65785f666e43c0f7fdf99e2e4936 SHA-1: 1f0a3df98766ae566f4258ebb88e6557aba192e3 SHA-256: 2471f85da0dbfada813d5483095fda6d507a0ecd70e5cd80a9f9d1ed38c46d95
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one heuristic specifically identifying a link to an algorithmically-generated URL, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://orig-shop-gsm.ro/ckfinder/userfiles/files/78192938750.pdf In PDF document text
    • https://msiutilities.net/documents/povanovukik.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/43222728438.pdfPDF link annotation
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/7448092408.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/71920421743.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/zokomupegaporabapojaxik.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/19171294667.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/xiwepibisazorujixusabami.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/sagubupuzites.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/losivobobosuwakonovoni.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/76247450351.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/21775821186.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/tidezarujikin.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ac0e00071787872a3fffa70cdec7bf02/jezenef.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/45776077927.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/waxoxujazofinukipepoz.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/pesabe.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/dopavofovitufodewirajuwuf.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/31009027721.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210905065357.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/semewibelumikurasadoju.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/33198328255.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/93073021286.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/jowolijugegi.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/vonag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=epistle+to+the+ephesians+pdfPDF 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_off0001165a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 10476 bytes
SHA-256: 6ae5dbda98ac2f0ae5651ffe956c46a743e77f9dfd06f45bccf3273f636b7e55
font_01_sfnt_off00012e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0E 18872 bytes
SHA-256: 3307677c6467211363077e60626badf9e29bfc838ebf2962272cdeb37cfcedc7
font_02_sfnt_off00015e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1