Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44eff8d9e19bc5f…

MALICIOUS

PDF

100.6 KB Created: 2021-01-14 07:19:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ebf74e9a03dbc18e6a06ab38a48a01c8 SHA-1: 78116313cbf868efc22db0c96bdbf8a63d63fc3c SHA-256: b44eff8d9e19bc5ff02abf61b4ef41cecec7e36ddb0df0831c24edd7b37cb405
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to host and distribute other malicious PDFs. The presence of numerous external links, including one pointing to 'trafftec.ru', suggests an attempt to redirect users to potentially harmful content. The 'SE_DOWNLOAD_BUTTON' heuristic further indicates a deceptive call-to-action within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/aws?utm_term=chemical+bonding+review+worksheet+answer+key PDF link annotation
    • https://site-1174179.mozfiles.com/files/1174179/watch_hockey_apple_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/gcjf6ih/88872092493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_5fb451cd9ef2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f9079a1bee08.pdfIn PDF document text
    • https://site-1084153.mozfiles.com/files/1084153/age_of_strategy_hack_mod_apk.pdfIn PDF document text
    • https://site-1196465.mozfiles.com/files/1196465/82078876559.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/jufotamolofu_kesonikugaz_xuwezul_tanijosume.pdfIn PDF document text
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/gewozejoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f8a9a7e6d2c9.pdfIn PDF document text
    • https://site-1177540.mozfiles.com/files/1177540/mental_arithmetic_book_4_answers_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_5faa3967762b5.pdfIn PDF document text
    • https://site-1171695.mozfiles.com/files/1171695/online_auctions_east_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/Pjhghqy/vlc_android_playlist_exportieren.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14319 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off00014d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D14 5716 bytes
SHA-256: c45fe34e981c9bc05469f2a472a0f85051eed595914b8d8802be6984b06df6f5
font_02_sfnt_off00016065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16065 10000 bytes
SHA-256: 0e9aa283ab36e792519623c414298170d3f9778772b0e16364c07520902e9805

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