Malicious PDF — malware analysis report

Static analysis result for SHA-256 476b5e9906211a39…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 04:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9567cc9efdfa3506e0d8a594bafb4b4c SHA-1: bec642564e95868f1b5bad3d51820e547be6e081 SHA-256: 476b5e9906211a396768863c313ff84d197c447d3b8c31472fb3178e54d2b7bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute content across many low-reputation sites. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://2016.letnifestiwal.pl/ckfinder/userfiles/files/53152015293.pdf In PDF document text
    • http://malagi.pl/user-files/fck/file/55606094980.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/78780072546.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/dafokefogomivekideba.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/vijulexojegisun.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d229af2a6---fefak.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/13148962427.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/xoxupadunog.pdfIn PDF document text
    • https://wrd13.com/force/file/56708088389.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wafojanizokejegikikexiz.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/ravopuzezigejet.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/mumofibekuxumorit.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/suvuvagibunimutalujimubi.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/17380481526.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/zokiwul.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/71646793770.pdfIn PDF document text
    • http://chinazzjx.com/d/files/111310202.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/biluna.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-15/20210915142012372897.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/gawominasugupavo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/varilojofodigude.pdfIn PDF document text
    • https://angkagenap.com/contents/files/jeduxotizepuxudogasaxip.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/31871300425.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/53930453291.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/tilasebuwejepaxojuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=outgoing+text+messages+not+sending+androidPDF 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_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 10772 bytes
SHA-256: 07d45b7e1becdba39cafd5870f37570901896b71f39a93fa1c97927ffbf89d8a
font_02_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 18388 bytes
SHA-256: 79e0fb3bfdc526b14900b6bda63236b782a44110782c3eb389b8f29da177c981