Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf35fe0cf4b323a7…

MALICIOUS

PDF

88.4 KB Created: 2021-02-16 10:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 267dc0619bbaeb6a61b65a1a8f840ab1 SHA-1: 4f845f7d2813a84184e1df33512239d832c76abf SHA-256: bf35fe0cf4b323a77bb058c5f747da6d4dfe352e5ff5d25e2b35565a16b52368
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the heuristic firing 'PDF_SEO_LINK_FARM' indicate that the document is designed to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://seumenha.ru/strik?utm_term=hp+laserjet+p1102+service+manual+download PDF link annotation
    • http://tugidunamoz.22web.org/sheet_metal_recycling_near_me.pdfIn PDF document text
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/basuviwudemu.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/madden_15_xbox_one_controlstvuwm.pdfIn PDF document text
    • http://piwakere.iblogger.org/alcatel_one_touch_powered_by_android.pdfIn PDF document text
    • http://espacecmb.xyz/kakevevet2nz1b.pdfIn PDF document text
    • http://uplrezina.site/10248715858m5jjq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://getetir.epizy.com/11778759641.pdfIn PDF document text
    • http://zaxukesaludu.epizy.com/tej_i_love_you_ringtones_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/antistreptolysin_o_titre.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/91186287047.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/assassin_creed_identity_apk_latest_version.pdfIn PDF document text
    • http://pasigajixivete.epizy.com/free_florida_residential_lease_agreement_form.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/calculus_ii_lecture_notes.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 5736 bytes
SHA-256: f6ac71b37d5355b399affb0c5f6bd18ca70bae0700f3e7387ea7bae7a451e57a
font_01_sfnt_off00012a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A77 12752 bytes
SHA-256: c0d71afaab4f65302fea76499745e0855a23b7345220b39b60db67abeea5c15a

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