Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cca8013e2b775a3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 03:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ff89262292057f8e4fc93b11f360313 SHA-1: 98091f5646a1b82b94b3482f8f159f89deb78cf4 SHA-256: 6cca8013e2b775a3990af0503678596c80155627eecde11bb7096f1df8facfcc
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous disposable URLs, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of many external links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://loadcell.vn/Images_upload/files/59447531669.pdf In PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/fusezuxo.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/9042991343.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/56853532477.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16142650d98b12---9098989066.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109160013252447.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/mipapudogunibim.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/geraruxemiviwef.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/govuraxomoxotanepijerupar.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/vavajoboxutuxugiz.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/52099944725.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/mulepifuvinelosisise.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/21277481696.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-1/20210901200707579542.pdfIn PDF document text
    • http://artepcb.com/upload/files/wopewisuso.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/sufesarewegowabefa.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/4369732025.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/36173417610.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/nitepepatizanedurarip.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/82752157560.pdfIn PDF document text
    • https://podimercrm.com/img/files/xabitabasapuvifekilozazof.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/lademil.pdfIn PDF document text
    • https://jobtiara.com/files/files/69727565871.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/c2p8ufj6gme51jkp8dv3leqcgb/rudemekupalovutij.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/gonefaleviwot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hdmp4mania+free+download+bollywoodPDF 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_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 18804 bytes
SHA-256: 15f0653545e6ae1f978fea5f44e93e548915d9f849d2a4ae4a0cd23f81fd94f9
font_01_sfnt_off0001140d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 10804 bytes
SHA-256: 64924b7f09c79cf89e89a93e45e39696a9c5752819ca3c4d25e1f636c017ee40