Malicious PDF — malware analysis report

Static analysis result for SHA-256 8933cdc2367463d9…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 02:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b20db90f212a7b1312f5d31bb4338ecf SHA-1: d0b1d2862ad6f4cc45b53230ffcbad9abdf25b4d SHA-256: 8933cdc2367463d9ab21c2faca091942cf1323583719f5ce4743a7e914704516
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as a phishing lure due to its small size, image-heavy content, and the presence of clickable actions pointing to external URLs. Heuristics indicate it's a link farm on disposable hosting, suggesting a phishing campaign. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://indel.sk/userfiles/file/gilukumamurir.pdf In PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/divosipaw.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/81778015.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210919095253.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/vekaninupojeximit.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/10223924186.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/29717274089.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/nuvakik.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/xenolaxirevoporo.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/vipefoloxarejodep.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/31710248929.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/2499785669.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/87e7aced78911c2bc1c78a6b4e8c4bc0/vizovotepa.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/ziluzigazituronoje.pdfIn PDF document text
    • http://horvathortho.hu/tmp/lofosedivotademidipe.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/tilipuzuxirevaz.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///73047611895.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/89238617921.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tanerubemup.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/26376386599.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/veponiguzipana.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210911105255_379274065.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/89037208548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=transformers+rescue+bots+disaster+dash+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_off0000acf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50A 11136 bytes
SHA-256: 0781fc81e6435c668aa5681a3c665f7766750aca619295ec6470b4e9824b6928
font_02_sfnt_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 14072 bytes
SHA-256: 53aada48061f9556947b6246a3ceffe32f148cbf74c42049e71685e01d44fd87