Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c162b53acfe4c4…

MALICIOUS

PDF

70.5 KB Created: 2021-01-22 07:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 42c43699176fb5e05d623b4550e06722 SHA-1: d345f7426823464ec66e359a4b072ba8ceaf26e3 SHA-256: 45c162b53acfe4c4aa105f51f03fca0df858b94e4ee495cafedd8b062a766dcf
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded links, identified as a link farm, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=kat+candler+13+reasons+why In PDF document text
    • https://cdn.sqhk.co/jifegusewe/jbVxgfc/25549708031.pdfIn PDF document text
    • https://site-1206392.mozfiles.com/files/1206392/domestic_electrical_wiring_diagram.pdfIn PDF document text
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/xetisinej-fubub-nejitorigoxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5fef898491fba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_5fd1d38d2d05c.pdfIn PDF document text
    • https://site-1254906.mozfiles.com/files/1254906/cadre_fireblade_datasheet.pdfIn PDF document text
    • https://site-1178278.mozfiles.com/files/1178278/add_text_on_online.pdfIn PDF document text
    • https://site-1172843.mozfiles.com/files/1172843/screen_recorder_for_chromebook_os.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/93368527093.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/30031823887.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/books_online_for_free_to_read.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/joretaradezikikejogese.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/pijexezud.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/lulapurupixufebonaxu.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_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 5404 bytes
SHA-256: 91b5ddb85ac26e2acaf7227699decd91aaf1a5bcf77229f9c674f661144c745c
font_01_sfnt_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 11684 bytes
SHA-256: 29a3646e32a7b5d17a368b1f8467990c32e4fd461d82d707c57c97514f61dd3a

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