Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3680a7c87a09b4c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 12:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 113e3e9613242d676d64345350f589fe SHA-1: b767b44ccec421040e9d33ca209e8c14306a1f53 SHA-256: c3680a7c87a09b4ce3f8138a6ce60ed57f8ca2146031a0970a7a8c2096e0a596
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous embedded URLs pointing to other PDF files. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dgssu.com/upfolder/e/files/20210904194624.pdf In PDF document text
    • http://napiarsaigh.com/images/wopujiwokadevuduku.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/75030342072.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/48686173501.pdfIn PDF document text
    • http://www.bash.cl/media/file/57717542200.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/49689577263.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/54640154469.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090402435884.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bixibokiwafexufomolaki.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/nozifakikip.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/91358111903.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/degogufezetapepov.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/93590631643.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcf3668ee---wuwojetaxulaj.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/49194473632.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/mozateseda.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/09115204647.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/86070466333.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210907055125_ljiky0.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/28131587486.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4d01befa773eeb986407ba3362e0f91e/9241525537.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/20007626288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=view+haircuts+on+your+facePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 10656 bytes
SHA-256: 39793e4e19caf17ca61732e65a9bcb78a708254e1f12d5ff3d2c70b9256dc0a1
font_02_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 17428 bytes
SHA-256: 6437e1077ed752b42d0242d12fcb6794aab20421adbe0fd4a26445cca98c00dc

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