Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe975ee711c2d36…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 05:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f39f55b709dc433b5c4e39f6ea8048e SHA-1: 49920efdfb5a3bfa9be204d86730e2d040e50139 SHA-256: bbe975ee711c2d364783a394aaf78ddeeb46f74837810721d7cfa674ae5ee046
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://publicbridge.pl/userfiles/file/33140152725.pdf In PDF document text
    • https://serka.com/serka/upload/files/pikijinav.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/vizizoj.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woperuxijusikunopabuves.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/38140435995.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/19225277294.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/81458585751.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/6372463959.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/gamuzararajokekejopexilex.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/24289676341.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/sugozirapitir.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17040571798.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/63253638605.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613041266e79a---49977284954.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/26215231816.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/44148886835.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/buxadus.pdfIn PDF document text
    • https://rintrans.com/files/tevizoserevojumokobe.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/95852974658.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/zafefuboruroxewefup.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/nanekekatowenilegivop.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/25912589866.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/depeki.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/47704415940.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/46602259202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=aktualizacja+androida+lg+k10PDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/63036724536.pdfIn PDF document text
    • 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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 10780 bytes
SHA-256: 3c2fb5f38fcc410e5ea9df49caabb69cdc0a606727e23bed04d6438363d21a49
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 18060 bytes
SHA-256: 8676f36400737a446573aa7b27456e4855dbf6c8b451d3f1f755a0b6f8f15866
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1