Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1018931a6b3138c…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 07:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08c034862baa40182ff67631dabc3582 SHA-1: 74dbb252e7c5ed08176d5e751ff1c38b2e00bb38 SHA-256: d1018931a6b3138c5884248d65fb92340b2ecda7cc39bf4cb8f7048b8bd7e4c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://allytemp.ru/uplcv?utm_term=malcolm+x+book+pdf PDF link annotation
    • https://glozor.com/userfiles/file/nugigupuvakuninaw.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/82513de0aa5b6c3596344c657ba2f571/77488497991.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/tixanidapufetu.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/jibedumikawekuxaninofapu.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/bedisojufiziru.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/80624228938.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091105195895.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/zazukozubevinemov.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/lisijobesetivotamaxoz.pdfIn PDF document text
    • http://precisao.net/files/files/42165456918.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/lerafidokafexuxizimola.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/pabevasisazaribo.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/39886877207.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/xoxupowofopavek.pdfIn PDF document text
    • http://lagrupacio.cat/file/zikifonipa.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109172354318679.pdfIn PDF document text
    • http://gyliver.ru/files/files/munulezosi.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/zupilalexasarefe.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/jujisamesorewe.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/97107108723.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/lumobif.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/8003652127.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bb91cd32b---99219976119.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_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 10416 bytes
SHA-256: e5930031299084b6ea1ee72a2a1bd646efa4de5f9b40ee583cd3369383b4bb71
font_01_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 18404 bytes
SHA-256: 0d6168b6342a5428d1097623c234d09c80d5078269fcaee9c9a009984bbf13c3

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