Malicious PDF — malware analysis report

Static analysis result for SHA-256 62cd12670d41da71…

MALICIOUS

PDF

127.4 KB Created: 2021-09-14 05:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1dae3b3ca2001173f6292f8aba0108af SHA-1: 99807d3186bb50d2f9a1c46899f25cef81c5df6e SHA-256: 62cd12670d41da717c35652cc6044313f0d8b0a32320e76042b6c811747b5d9e
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134be1461627---46103105846.pdf In PDF document text
    • http://norilskgu.ru/userfiles/file/motubuwigaxoxiwi.pdfIn PDF document text
    • http://osayit.com/images/file/50980655304.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/xagixatov.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210910_4BAEB013415E5365.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/kufako.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/82589841369.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/56583991789.pdfIn PDF document text
    • http://taociren.com/upload/file/210902031228308877fz7hmucknhvo.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/limamabigesiverawaz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a59eece7---59617910040.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/kiboxi.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/23163592315.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/46834568500.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/xuvaruvokepugagujuv.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/40530071014.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/77561980357.pdfIn PDF document text
    • https://olterus.org/contents/files/pexugirazefosesuwe.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/wedulojaseg.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/nexotanale.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tunesodelizibubuloxif.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109091813054598.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/gutujodokuwisebuvatumuwed.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/75664873282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=star+walk+2+for+pcPDF 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_off00018ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6DE 10352 bytes
SHA-256: e2f6ae8d95a02a50590e5ceb140c83c4d4d80b2acddf948a58282de28399edcb
font_02_sfnt_off0001be8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE8B 18744 bytes
SHA-256: a9da70c10e280da598f352f51cde8adae162e6f8ef677abc676a5bf752563ce7

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