Malicious PDF — malware analysis report

Static analysis result for SHA-256 655d4d62f645fced…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 04:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8ec9a2be64187701ac2f0602f2029706 SHA-1: 4f937bb9b59e3fda70a1ef9d6925593b27667628 SHA-256: 655d4d62f645fced197969bd457f0f87e1748b556dc74df4a0f0e1bd20451c58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://maintogelonline2.bet/contents/files/negiwisivuketebikunidom.pdf In PDF document text
    • http://moderncarrent.com/user_img/files/fipamomowajovopenibi.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/vusixijovipolupidaxadag.pdfIn PDF document text
    • https://bunianco.com/other_files/File/konazisaxa.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/63895540358.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/33906509407.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/190609028852.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/57191839626.pdfIn PDF document text
    • http://zzquansu.cn/d/files/99604032348.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/donuz.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/petozemopodala.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/papowaxano.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/133476254.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/55590880687.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/kejejekitumiwezulurutag.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/89839405245.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/11611204640.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/13a87bbd03d699da2b8e2d5b47b5f38e/pixajevame.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/15735030901.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/wubefez.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/4e19a0019142e582581433c171612adc/wopefeweruwefo.pdfIn PDF document text
    • https://12shio4.com/contents/files/93290634947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=blocking+private+calls+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_off0000bc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC19 10900 bytes
SHA-256: 902683340d781a3920bb6cfcf9c77947cabe03cbb278e1209517d53672328d3d
font_01_sfnt_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 17480 bytes
SHA-256: ae3afe147282a7604196b73d844ddd3d9b24511c12b059d4169475733d68cf21
font_02_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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