Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4615d978307181…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 04:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 382ec77180eab33821ccefbfdcffab68 SHA-1: bb9f0d49c67fe766d85c63576f42109e2aeb9a5f SHA-256: da4615d978307181a3513687d9781c43e94cf66993716f6b26d190693d2e450a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, with a high-confidence heuristic indicating a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://yuha.be/_files/file/24971699583.pdf In PDF document text
    • https://khambenhxahoi115.com/images/files/sixorovusuwixadurepilar.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/96916237872.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/89246661457.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/pivutebademamefu.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/92895442108.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/fupozureb.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/34688000913.pdfIn PDF document text
    • https://morabia.fi/images/file/zegefeb.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/dejasupa.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/rufalenofij.pdfIn PDF document text
    • http://dd-eng.com/files/files/80787569936.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/45379492071.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/36479395021.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4bb1b8b346ee05eb7d4ec6a9c4307a47/2095187310.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/miwikobabumativavawu.pdfIn PDF document text
    • http://change4best.ru/upload/file/medateminejorexoneke.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/67727199190.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143a6feb184d---23193347954.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/39618367017.pdfIn PDF document text
    • http://wawa757.com/uploads/files/70910275886.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/87646770747.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/71913110098.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/53601443246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+4+bullet+gt+cheatPDF 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_off0000c04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04B 10280 bytes
SHA-256: 7ed148fe14bb0a1f010e4fc85bfc77a89c06602202793b7948ce3db372d6acbf
font_01_sfnt_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 18028 bytes
SHA-256: c17587c322923dba68ee020291f2d9d1e41bf1d9a4efeb81e61197e8c63635cd
font_02_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1