Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6f12ceddd0c123…

MALICIOUS

PDF

82.8 KB Created: 2021-02-20 18:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b5cb721d9ed148a36f40cd089512b86c SHA-1: d576a5b955419a0c61140a17e1d27805dc8d3623 SHA-256: ac6f12ceddd0c123785f043990d21ee6d8d0917db47da037dc084e8d1bc04fea
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious link directs to 'https://yafferge.ru/aws', which is flagged as a malicious redirector. The ML classifier and ClamAV also strongly indicate maliciousness, suggesting the document is designed to lead users to harmful content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/aws?utm_term=merchant+of+venice+act+1+scene+2+reference+to+context In PDF document text
    • https://dukinuvofipul.weebly.com/uploads/1/3/2/7/132711936/6296461.pdfIn PDF document text
    • http://repair-planshetov.ru/on_the_road_movie_netflixl9kdd.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/4240bb60bfb699.pdfIn PDF document text
    • http://cardioactiveuficiale.site/irobot_roomba_606_manualmwv2t.pdfIn PDF document text
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/127783.pdfIn PDF document text
    • https://gedimonisesejed.weebly.com/uploads/1/3/1/1/131163996/4028385.pdfIn PDF document text
    • http://1xbet-registrat.site/free_english_worksheets_for_year_10urf79.pdfIn PDF document text
    • https://sujarazigis.weebly.com/uploads/1/3/0/8/130813042/2604420.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/bofake/exception_java._lang._numberformatexception_multiple_points.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/kipejasu.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/kabukolaterodavenipal.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/yankees_injury_report_mlb.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/felubexubegafavirazopufet.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/basic_piano_sheet_music_with_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/68596774398.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 5044 bytes
SHA-256: 12f101d5d2fc29782f20b2a7d71984e6858da1c1fdfbf54ada8caac0f0742eb1
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 9828 bytes
SHA-256: 78ab4bfa4f26f9992355e0f3c5847892d51eba184965dbd3e26aaa2d852458fe
font_02_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 16364 bytes
SHA-256: 3d4749d6100daadf53acbf3b8f0af377f764a48496e0806ab6baa0478a5fbb9e
font_03_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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