Malicious PDF — malware analysis report

Static analysis result for SHA-256 62edcbf3e8975d44…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 23:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8b43646e6b79a0aa47178983b75399d1 SHA-1: e7e7771f02a1cc2271eee3f2fffa69ba05e5070c SHA-256: 62edcbf3e8975d441c670e8481b0a17963e7e2e08cf229e29ff161aa192cc3fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and ML classifiers. It contains numerous embedded URLs pointing to external domains, many of which are flagged as link farms on disposable hosting. The PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the presence of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5003

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://chcial.ru/uplcv?utm_term=rosa+parks+medal+of+honor PDF link annotation
    • https://uleshuzataruhaz.hu/files/file/90961655157.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/dekotobog.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4e72615e---5372123155.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/90254611341.pdfIn PDF document text
    • https://remini.hu/userfiles/file/69809247681.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/96322334620.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/baxazarakuxodezapigirate.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/95097181985.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/gs1idp7pcj9ncprpom692qrilm/10255647321.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/lukaf.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/99266730889.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/12370174468.pdfIn PDF document text
    • http://carbontuning.ru/file/xubogelak.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/govebetupubi.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/16143523780.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6146A38A84146.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/kajevalenekapisixizo.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/xixomexaxeloni.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/vavonapibajiranus.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/38566240507.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/panodaxemido.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/28453622098.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/dosapiperilem.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/95321872591.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/ponadegizun.pdfIn PDF document text
    • https://unosms.us/userfiles/file/91246523766.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 18024 bytes
SHA-256: 8175423554d93cc8eec42f79764a14f7995542e3d40ea89437b60ee0e7e3f492

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