Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a46138badd0456…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 15:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d82adb92a4972765cb2e26aee81dd3f4 SHA-1: 2d2902cdeeac2b4c454c8fb2f279bd7871145ffc SHA-256: 11a46138badd04562aa31f2ebe7a46c09c4824af8109a8ba844c3e5fc44930d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identified it as a link farm. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ciaomamma.hu/editor_up/62641083683.pdf In PDF document text
    • https://svilia.restavracia02.com/userfiles/file/kofigisej.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/keradudabafaloji.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/resebadujurabufaz.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/3954559580.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/mawiposisiximadudin.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/2595490153.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/fazitetipe.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/74681837591.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/mededasudukubej.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210907052756_ei0065.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/60768287018.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/tosexapagivivetemokati.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/labajekol.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/buxigeteziboziboruzu.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109120232071536.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/74293297552.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/83170077683.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/xavediluxo.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/8576025902.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/nujedokafedowob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=muscle+car+stunts+2020+mod+apkPDF 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_off0000d355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD355 11008 bytes
SHA-256: b8259dd4ffa947f48de6c9375ead46ebcd9d6efefc95dd189d92840b6a77445d
font_01_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 19496 bytes
SHA-256: dd09a37d7eab08b350278cdc3f93a24690cac3f4726ffea3136c0f95458d0ac2
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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