Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a0623d64f9f98b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 02:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5efbfc53cf188d64cf39f407ad245b95 SHA-1: e3c1fff8d43390aae41a96106dbf9263ee4558be SHA-256: d7a0623d64f9f98b6717caaf396da5e5a1cb9d5ab27f79f9992494e54e2589e4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with a high-severity heuristic indicating a link to an algorithmically generated URL on potentially disposable hosting. ClamAV detection and ML classification further support its malicious nature. While no scripts were directly extracted, the PDF structure and link farm heuristic suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://distriparkbotlek.nl/userfiles/files/musasodafomeb.pdf In PDF document text
    • http://abwjefferson.com/uploads/files/75132291886.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/40469519812.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/36309432020.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/22965889930.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/kujilugukamejoderiko.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/63578730558.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/30216439967.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/vawikirabufed.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631120054.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/p09mmhc272udcjvj5n3vfqh6qi/24645470765.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/dipoxewanomifaxuzot.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/55579354998.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/nujinurimaj.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/97734374497.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/64567395364.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xosopasofijusituker.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/tusazipixopusuxe.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/13129256055.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/74389114001.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/47845852164.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/71173669752.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/62240324734.pdfIn PDF document text
    • https://eguiders.com/uploads/betonizupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=live+sports+apksPDF 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_off0000c466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 17756 bytes
SHA-256: ff92b48537d85038a0cbb4d57341df014694e3c26b8c3122661023ed22ee9a8d
font_02_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 10208 bytes
SHA-256: 9acca328e33895674dd73d70e5c54e38c3fa18e86cb121a8b07a4848eeb0d4fe