Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b76ea1782cfd85b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 21:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 941ce35a6725610de9232c6687cc931b SHA-1: 86defb11deb2410e38bf598d13ca8c3a6ec9dec1 SHA-256: 7b76ea1782cfd85b267fa94ffc48c76f382f813bfd773407b37bdd74abda8706
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://philabc.ru/uplcv?utm_term=minecraft+pocket+edition+pro+apk PDF link annotation
    • http://creaorganization.com/depo/sayfaresim/file/xakovusesunobiraf.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/zadamavomigebavexutejupi.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vosuxomujexo.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/77052974346.pdfIn PDF document text
    • https://lasanisports.com/files/xopatakebonifa.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090619192170554.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/tigukixesinevujozesabi.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/xuwitirufozobofoguranol.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/43722020728.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/31811793493.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1775949228.pdfIn PDF document text
    • http://abnicum.ru/files/file/kepikimimatamotalimazuwo.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/83847796106.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/19849396021.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210919_28371AF64A57D1D1.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/46230144619.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/dimemazonopewez.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/59917637680.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/tijasovaripajuluxule.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/fowibodakimujikawu.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/dafarixufofixigofa.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16312203063392.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/7867319244.pdfIn PDF document text
    • http://erimti.com/userfiles/file/woseripufokewenasumo.pdfIn PDF document text
    • 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_off0000b9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D7 10484 bytes
SHA-256: 0e2b394fb04d45d8579258ba3f92c3b92552294e01119fb32c6b94dba5b88e6d
font_01_sfnt_off0000d1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 15740 bytes
SHA-256: c8f0e5c9f71e60334a6c1e3c85b6bc04b36cd249b48e4bdcea6242feddaf137c

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