Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c5fb57e062c936…

MALICIOUS

PDF

78.5 KB Created: 2021-09-13 07:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 489f46d0d7200da2efaad1b3f36d1412 SHA-1: 35e64c060c9ca85bdbac66e25d2e9e2ed0e7df83 SHA-256: a4c5fb57e062c936808c059bb11089429f2484f76287141b498d0b46e0f0239f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 pointing to suspicious domains, and exhibits characteristics of a link farm designed to obscure the true destination. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nickelsgrafikdesign.de/ckfinder/userfiles/files/41172586133.pdf In PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/67010870228.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/zelivuzizonifu.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/lobodegawegofenas.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/12311409898.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/welolatofuj.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gagimijijovikimibosirot.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/29266659636.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/xixolelefiv.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/vosoluvej.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202194_1559_805.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/6560707216.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/xabepuxilobojinekibof.pdfIn PDF document text
    • http://wixoon.hu/upload/file/wemofawaruzanajilav.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/91489108480.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/zelijig.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///jadowutipawo.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/pudowumumosijun.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/47957244552.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/67455565512.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210906171032_1446183763.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/japaxofoma.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/vezikivolelu.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/zowafufunom.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/fenililajurosokifevad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+recover+saved+wifi+password+on+androidPDF 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_off0000cced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCED 10708 bytes
SHA-256: 35f6d2873413535f93603e6e41b2531cab3d20980d000a62921a930af9ae38e2
font_01_sfnt_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 17800 bytes
SHA-256: 7926bac12f569b8c1ce993ae1fa6b31d0a78decdac8e9762b156bb0909dd299e
font_02_sfnt_off000113dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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