Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a53a60d3c590da9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 02:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3790438e4160621e5edf9373944f19b7 SHA-1: 4ac33b053c8b29d8056161c6ac5ac83c84ddf6a6 SHA-256: 5a53a60d3c590da93204dffb682e71b01f7fc5f09808e9150996fd5fb77b50ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are designed as a link farm. This strongly suggests an attempt to direct users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pixomot.ru/uplcv?utm_term=alexa+play+music+on+multiple+devices PDF link annotation
    • https://jin-ji.com/upload/files/lusetapolaxigudetedov.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/55538516711.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/65460472124.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/katifezasirakanoremokurim.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/6152474932.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/felude.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/gedomaxejotozubomosejom.pdfIn PDF document text
    • http://faradbox.pl/files/file/wumosix.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/12789038930.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/wuriberujofexumiruvusumu.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/fagezixabinafumex.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/9579328770.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/mavukuwojofar.pdfIn PDF document text
    • https://dcimx.com/files/84806472024.pdfIn PDF document text
    • http://stealthwindow.tw/uploads/files/202109080516128846.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/wefibuzerazuxufepikidonu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356b0a9741f---21500173541.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/venanosimemorewefil.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/66105373015.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/80652909743.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/vagemeluwojagiwivuwarez.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/7332511665.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lezenasefete.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132de5e8fa0e---tekokixi.pdfIn PDF document text
    • 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_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 10936 bytes
SHA-256: a2e0385c47099f99f0226baf0fe4d8b31e9f03484047671d3bd24c9c93bf2ffb
font_01_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 17784 bytes
SHA-256: b93ac0ebd452e215dac945a5e842bda5970f086da4401548541c641751ee3f1b