Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb3a520bf656024…

MALICIOUS

PDF

68.3 KB Created: 2021-09-13 05:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 572f7e186a5a662ff8ec868d2141a444 SHA-1: dd6fde2da8d1f350acff9e2edab7cbc81e3e90f0 SHA-256: abb3a520bf656024c71f381fb229591de6427df693e48608c7b4bd6b6c5824e5
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://philabc.ru/uplcv?utm_term=back+up+my+iphone PDF link annotation
    • http://opersan.com/file/wisesubewuvalafakisafe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368fe162856---43975969309.pdfIn PDF document text
    • http://www.siposferenc.hu/html/24483808046.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/padadukoj.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/ratejigiwanakazo.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/19376016939.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109091021571743.pdfIn PDF document text
    • http://villkasz.hu/editor_up/damapujomusowoxafosatat.pdfIn PDF document text
    • https://kuepancong.com/contents/files/kuran.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/pugukikubuxadupifoz.pdfIn PDF document text
    • https://datajournonepal.org/files/fitidilurejumimutafug.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/zutimewixuwupigonivoxu.pdfIn PDF document text
    • https://hinaweb.com/upload/file/modugolupoxeromagagalavi.pdfIn PDF document text
    • https://aitalk.vn/upload/files/32160626401.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/33769801877.pdfIn PDF document text
    • http://bluebossa.pl/files/file/52422345838.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/xubezipejufula.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/fed191bad4675e0476e4765aac234d3c/96480160.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/zarusirozitodit.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/zowamuvimupumowide.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/11/56702862460.pdfIn PDF document text
    • https://bliznacite.com/files/59514957009.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/60107671865.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_off0000af34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF34 14612 bytes
SHA-256: 8f31b5ff3e359a84eb5ecfb11e23fffe7d0242ad68fb361fda1941f533bb2570
font_01_sfnt_off0000d3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 10584 bytes
SHA-256: 99f2475aaa70806001c1bfa657782be5bd2ec272b54f533b0d2de4293970124f

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