Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b053db6c4c622ca…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 17:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cd72418fb8eceef110d29266dae127a5 SHA-1: 8ad2c9e4a90f4d15e14ec124ad21f8a1605f6fbb SHA-256: 6b053db6c4c622ca1bce578d5cd88b1a93735e97a25fa01c20f971b51b039168
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier further support the malicious nature of the file, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://80tner.friend-match.com/upload/files/jafisatalegurejogi.pdf In PDF document text
    • http://gleb777.com/fck_upload/file/59723975901.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/9314030637.pdfIn PDF document text
    • http://195exim.com/datas/files/jusasijavefu.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/86945183753.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/89713466282.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/51641028672.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/lopewikobobawuluv.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109031103576963.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/sorubenoruxa.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/tepaka.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/rugom.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/rovugirajomoben.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/20048465778.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/55404475489.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/belativizokulebepag.pdfIn PDF document text
    • http://cudicio.it/images/file/diginugowenizilokomu.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/refow.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/64502066918.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/guxogawixa.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/44772625bc89d065efc7a172804335bf/dorijafanomu.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/41823725451.pdfIn PDF document text
    • https://preciseenergygroup.com/media/setadomameleraxuj.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/84643581240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=class+6+cbse+maths+textbook+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://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_off0000aebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D1 15504 bytes
SHA-256: a32e23bdb19d0938a75879167fb8587876179b849899ef7416d30da8802274f6
font_02_sfnt_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 11120 bytes
SHA-256: 070eda1754eb5428148c94c0987b2670a7492340a061a5a64fab35b90b446752