Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f16db3d97c8e067…

MALICIOUS

PDF

99.6 KB Created: 2021-03-23 13:37:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 835df2c4ecd2922b45fd91f1dbaf4306 SHA-1: ce7ecfa0b5e0843fc15f0fadb3a06f3d0bb00e94 SHA-256: 9f16db3d97c8e067d74b3347c719091210691a8ba40e244fdc1b20f126853137
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits multiple high-risk heuristics, including the presence of invisible links pointing to suspicious domains and being flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The document likely aims to lure users into downloading further malicious content or engaging in phishing by disguising itself as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botokaw.ru/award?keyword=abnormal+psychology+pdf+pearson PDF link annotation
    • http://myfoxing.online/41233856500bn2ox.pdfIn PDF document text
    • http://fuxewofuwikafu.iblogger.org/autopsy_report_template.pdfIn PDF document text
    • http://shoop-ff.ru/toro_20334_air_filter42l2i.pdfIn PDF document text
    • http://ijmalan.xyz/87120199708e89qu.pdfIn PDF document text
    • http://gezowipefu.22web.org/how_to_type_alphabet_in_iphone_6_keypad.pdfIn PDF document text
    • http://smilex.club/windows_10_version_1809_iso_files3p4m0.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/school_management_system_phpdang6.pdfIn PDF document text
    • http://dfds.in/980003223074uguq.pdfIn PDF document text
    • http://opendouche.xyz/2182542158077ocg.pdfIn PDF document text
    • http://bottlechainworld.com/467429728914kyzx.pdfIn PDF document text
    • http://idealicaitaly.site/948058650462ch7.pdfIn PDF document text
    • http://national-verifyteam.com/somoketimikubexovizarowesirlnm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/22763249106.pdfIn PDF document text
    • http://vawamunasujefu.rf.gd/27495961265.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/what_does_don_juan_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd165cd6-7987-49d2-9076-e8aa3714dbd8/english_phrases_with_urdu_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e904300-c179-4fcd-92f1-e9ff8ee288e0/what_books_are_only_in_the_catholic_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/vaxudigitimenezovolavowo.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 5460 bytes
SHA-256: d9a808384685c256e247805f865ef5f42c9e276ddfdcf47f05fe8f3f659f2731
font_01_sfnt_off000123c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 4752 bytes
SHA-256: 2e82b6de01855d7d39b51a0b9cb7c6044d409eebb0f44026a489efcf6e42fd2d
font_02_sfnt_off0001355e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355E 11484 bytes
SHA-256: 6c6f9df05b9af0ea2e0d5e20a79b3f30b3058b723b1e423731541a6bc30f096d
font_03_sfnt_off00015bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBE 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
font_04_sfnt_off00017026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17026 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e