Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6b3b4a6f890c48…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 16:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 61d46000ccc9d1127e569ebb322aec1a SHA-1: 049d3e3c7faef61279d1a591e838dbc9092b0819 SHA-256: 9c6b3b4a6f890c48056da33349ef76a5dfa011c0434b5897e9dab59fd70d0039
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external resources, with a high-confidence heuristic identifying a link to an algorithmically-generated URL on a suspicious domain. This suggests the document is part of a phishing or malware distribution campaign, likely using a spearphishing attachment as the initial access vector. No scripts were extracted, but the overall structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.lsv-wittlage.de/ckfinder/userfiles/files/2369712502.pdf In PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/19911722786.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/51283303362.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/44949907895.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/patajelanapufusili.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/74214241294.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/sasanefasobu.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/muminaduzozejorolixi.pdfIn PDF document text
    • http://aimic.com/userfiles/file/49801965067.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/52559856220.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/mubok.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/3183328229.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/tigawiwuxukegabimonufum.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b901d11a94737dc6ab2d784248d29bbb/bulunixaze.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/vibojalamudelilavaduse.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/suzeribiwetifas.pdfIn PDF document text
    • https://majubesar.com/contents/files/24872378421.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/povodujima.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2bde0d34def31087628f6aa8350eea90/xilolimiv.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/6735535799.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/wevoxanapoveri.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/menazuk.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/jugiromenuku.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/molejababufizipevage.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/5440399167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+enable+android+system+webviewPDF 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_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 10904 bytes
SHA-256: f8fd3c34fb9759df259f6e81dcca92805dcb08f163204c0773c03b8d4b0fba56
font_02_sfnt_off0001168b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 17892 bytes
SHA-256: d797a9cc8b65a3d4b79ac52c152eaa9c5425a7164e34aee63b8e78360ddc5a6d