Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ca460ef2652ca3…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 15:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 502f8018f825a6d7102ad547f2725a1a SHA-1: cb6fe6ac34aa67deef52132fdae8363ef88277cd SHA-256: a7ca460ef2652ca395bd901806eee444e5685479fa85226e34bae64a1fa0fd60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to various domains, with one heuristic specifically flagging it as a link farm on disposable hosting. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=restore+apps+android PDF link annotation
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237dae0f22---ponofowuwaxobumo.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/44918179520.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/navenusetid.pdfIn PDF document text
    • http://atek-ent.com/upload/file/11390241182.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/pomewevaxemoxajulef.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/48509344475.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/jixes.pdfIn PDF document text
    • http://henca.com/files/details/file/14796337199.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210911011014.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/498003618.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/23411962282.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/21136476724.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/77036466666.pdfIn PDF document text
    • https://izr.fr/files/68103948952.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/62995628498.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210912_63C6AB45449A049B.pdfIn PDF document text
    • http://partnercable.com/files/sefuzidudonarakolugex.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/bakuxuxabixirig.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/xejabulilozaxikepan.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090702371317.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/wutumolazobosokedowa.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/78948458046.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_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 10384 bytes
SHA-256: bb567f3f5c274faca70803025a5dfb67d356ff161bd8188ba42c42c0ff2f1fa2
font_01_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 17116 bytes
SHA-256: e428204e60a1278d3438a999b9af40ec062e161879fa3778282991dfede45f03

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