Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd0a6519316eca6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-11 18:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a009cf93b682c99d2845dba821c52e1a SHA-1: 1c99b9c20857b7b813ba2ca80d1a7e305c11d729 SHA-256: edd0a6519316eca613cd11d1d9867e13b2675d4dd7b9168afdaca893e1d0f0be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates the PDF functions as a link farm, containing numerous external URIs pointing to potentially malicious domains. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://vaynhanh365.net/contents/files/89789372226.pdf In PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/tikaforepogasapomufa.pdfIn PDF document text
    • https://dcimx.com/files/36686214837.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/43276776815.pdfIn PDF document text
    • https://menu2uplus.com/images/file/3105099787.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/wogetuvotuxaboxizopigeru.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/61724845355.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/nodowakomamokubikikig.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/3005318049.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780e71c18f---78693441981.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/zoforota.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/toxikapazosubulijanevaji.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/xiluzanakitivaz.pdfIn PDF document text
    • http://vinmexindia.com/uploads/zinebulifamitafiwewepum.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/5in3eh9kd9llasckmhqg3i6jks/91117687033.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/2270763462.pdfIn PDF document text
    • https://shunnasato.com/24531388687.pdfIn PDF document text
    • http://slsnn.ru/content/files/xazefiveselaz.pdfIn PDF document text
    • http://newmob.it/userfiles/files/57946309256.pdfIn PDF document text
    • https://geniodelweb.com/file/popoloronolufebetowok.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/40285506006.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/rokotiboro.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/risarodofegu.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/putifotozulanefiluv.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wireleboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+clean+your+phone+cachePDF 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_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 10504 bytes
SHA-256: c6b2d03a91ed5fe759666bd0c169bc37bfd2b21d0b319cfb4d3fae3773cfd6c2
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 17528 bytes
SHA-256: 5302c5e54e17cff1a0050c31bd9b302d9d365a4ab467a1136693d4073c21d716