Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d1fac7e4b8b7fe…

MALICIOUS

PDF

74.8 KB Created: 2021-01-13 03:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c7e7406a72dcf290810c95752896e688 SHA-1: dd7b32af190b3ece39baa0cd3b0a1142ca8ee17c SHA-256: b5d1fac7e4b8b7fea77db25ba193c2b0143444fd8eb5360667141023826aeb7d
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?utm_term=c%25C3%25A1ch+t%25E1%25BA%25A1o+sheet+trong+excel+2010'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates a malicious phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to Excel, suggesting a lure for a document-related scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://cctraff.ru/aws?utm_term=c%25C3%25A1ch+t%25E1%25BA%25A1o+sheet+trong+excel+2010 In PDF document text
    • https://site-1174576.mozfiles.com/files/1174576/sikufesameroxuli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485310/normal_5fe37a9524284.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/XwBG82i/2020_election_results_cnn.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/jajduol/ikea_black_friday_coupon.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwasazafu/iiijdia/pottery_barn_christmas_ornaments_set.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/pibabopuduj/guide_michelin_restaurants_toils_paris.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/a._k._a_jika_video.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/yesterday_beatles_guitar_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/68745412925.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/75716222296.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/quotes_about_morality_and_ethics.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA4 5608 bytes
SHA-256: 9a0b81e5e6a868bb062d93d29912b6ab519ce412148612c58bc679a316349088
font_01_sfnt_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 10928 bytes
SHA-256: 88d000b651af195dd4447709b522385eb0c02cf7bd1ef5858791be304dce2e3d
font_02_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 16376 bytes
SHA-256: 069f5cdcb972b33999f3dc18a3e5b847fc2aa024b7c5b45b4734cedf253a8e5c

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