Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a4129cfc00c57b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 20:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f0055d7936bda16d88a3c20201ff92e SHA-1: 44d1ea73f524c4a9b3df03725d6da127b5c50537 SHA-256: e5a4129cfc00c57b9ce6ffb75fef9d7b073dac68ee30d61094a160d8212b2196
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://technimexvn.com/images/ckeditor/files/58874452796.pdf In PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/getabegiwevebid.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/xusigokaja.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/51046060679.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5692178628.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/9056702494.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/vomagexanidasuxetor.pdfIn PDF document text
    • https://tierlistei.ch/downloads/gigejilolajokomobu.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/68227754519.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/96173177097.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/61089091076.pdfIn PDF document text
    • http://ruihuitax.com/files/file/94361849002.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338da843c7c---32014372953.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/84177722768.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/38754487890.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/zexedemedividuxi.pdfIn PDF document text
    • http://weldingplaza.com/files/file/84016138711.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/varadobodivukisarobelabod.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/runikanonuperolar.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/72612858416.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/tezusonilovizulesezaj.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/buleb.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/nawokukebone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=untitled+goose+gamePDF 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_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 18140 bytes
SHA-256: 49343550d7161a0ddf6cd7fd696b5f15b9a57a7ba9c1c9479e4f35f55602fcb8
font_02_sfnt_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 10500 bytes
SHA-256: 84271dbf548c38028dadefdcf1c0369862c8a5ce00e28684135ffd1653deb70d

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