Malicious PDF — malware analysis report

Static analysis result for SHA-256 8334ea1baa4bc403…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 23:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae6341da28d6e3277a31d165ed4a5ddc SHA-1: ece77740c7e444d6fa74eb363673fba5e2c04311 SHA-256: 8334ea1baa4bc403100f8ead0d137b01a2d697c9da9115c4fa0b103ca1946ae1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct PDF files hosted on various domains. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://tvcsoltau.de/userfiles/file/18623440560.pdf In PDF document text
    • http://ysenb.kr/board/file/editor/file/92821044965.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/novebegumeb.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/kawaterabar.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/42708526718.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/lexawaxifixarewenizofira.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/wumagowogubosawotoz.pdfIn PDF document text
    • https://davaocarrental.com/images/file/liliziluxo.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/51606746522.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/97103853629.pdfIn PDF document text
    • http://sinostandards.net/upload/files/45485906124.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109051736481096.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/ladebusokamodudod.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b1ce6d16---83698360380.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/nifijenimeximiveworota.pdfIn PDF document text
    • https://phm.vn/upload/files/lenapeziwijunoxamu.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/gawilotovul.pdfIn PDF document text
    • http://cx-gl.hu/images/files/1641550393.pdfIn PDF document text
    • http://snft.ro/media/file/xibutonomifurager.pdfIn PDF document text
    • https://bor-diing.com/upload/files/79546209663.pdfIn PDF document text
    • http://darec.sk/files/files/kufumixagudojexowigoro.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/67831177079.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/92013226033.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210913151423.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/52087c46a57bc80bf1f7e39e4c5bdd8b/21873308172.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/kivod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rich+dad+poor+dad+online+freePDF 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_off0000b222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB222 10496 bytes
SHA-256: aaf72a49332dd80f26a29594124b6fcd95b68e5ad21aa2e9722c49912a74b3d1
font_01_sfnt_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 17204 bytes
SHA-256: fb653fb45f9503b8279cbbb22cebc697db8ba6bb48f727881e1424511d662f60

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