Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc917c4655c328e0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 05:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0ccc7de780fb24586f22e66b6078018 SHA-1: d7e2222efde9cc723fc3279935b6281bda10e200 SHA-256: fc917c4655c328e0135c345c3ef3f13939bcd5a9357cc6a7f787a65fb278c68f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and heuristics point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://molenat-energies.fr/molenat.com/images/editor/file/76052851364.pdf In PDF document text
    • http://willajarmar.pl/userfiles/file/xejetolubez.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/kafeboramebosagipivimi.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/sorejulojabokuf.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/tibogakusebe.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/xujuzaxanejogubemeni.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/dibukasido.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/viwesikopoba.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/gobuguxopevetodujazuvosiv.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/niduroruwinoxub.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210908202917.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/banitijeben.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/govojeniwiz.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/60sfteuu63oheshbh56dih76k6/60733782662.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/patufodemolixijoxunat.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/retekonenubenizudigu.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/rewipo.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/72516531718.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1701476fd---jasawi.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/85358772797.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/56955608114.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/lakujefogasakolex.pdfIn PDF document text
    • http://minipit.com/data/files/21250296147.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/fikukisitimumaxebovis.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/tanepamifevixip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=eco+cat+mod+apkPDF 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_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 10108 bytes
SHA-256: e1dabd3be2133361701b57ef840c9d727a1572409c42129ed60b7c0c298c3ff5
font_02_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 17144 bytes
SHA-256: f7a3dbb6fc6e460bb6ad2afbef17fa1b0ea7dee94803d7a0cc7b6b2ecfb41e5d