Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c24bd4b58a9b778…

MALICIOUS

PDF

102.9 KB Created: 2021-03-24 00:48:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4540b2d234df89136ec502d0c140872e SHA-1: 2707698a4bc0062805ea35323dff5d8311960a02 SHA-256: 4c24bd4b58a9b77894a40545cd554db88bb7ea37403a7faa1e9f73a27e76c853
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm designed to distribute malware or phish users. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'https://yafferge.ru/123?utm_term=forgiving+yourself+worksheets', indicating malicious redirector infrastructure. While no scripts were extracted, the structure and numerous external links strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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/123?utm_term=forgiving+yourself+worksheets In PDF document text
    • http://vugewanir.22web.org/bifago.pdfIn PDF document text
    • http://gosejoligezo.iblogger.org/bootstrap_modal_form_input_focus.pdfIn PDF document text
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/7922179.pdfIn PDF document text
    • https://sajadarazaga.weebly.com/uploads/1/3/4/3/134340855/72bf8f.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/89cacf8b050a019.pdfIn PDF document text
    • https://lotatodekimin.weebly.com/uploads/1/3/4/7/134705716/1398522.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/zusevamasor/druid_circle_of_the_moon_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d573431-ad50-4966-8774-3b666c9461e7/36291208884.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/trial_balance_sheet_debits_and_credits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb088649-b32c-4dc6-a0b6-6cda5f912793/73916316554.pdfIn PDF document text
    • http://lumolak.rf.gd/17670875368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f7d57f-0bc0-4105-90b6-6d60757b2071/kaduvijil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc8b0493-2ffc-491c-8a50-8ca382b4cd98/social_psychology_david_myers_12th_edition.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_a91438c063d94ac78a4a9a6c229d03ad.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_81f76de67eef4a22b017d0d1dd83efdf.pdf?index=trueIn PDF document text
    • http://vewomani.rf.gd/xufeboxamoxowa.pdfIn PDF document text
    • http://zusobasiluwu.rf.gd/2_and_3_times_tables_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/hello_brother_songs_in_telugu_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd85b23-2b48-47d1-a8ae-d174064924dc/how_to_turn_off_smart_drive_camera.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/vomopiwugukigosaxijiwi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CF 4972 bytes
SHA-256: 53427336d6b6c128254669250f0d5595616c3aa082b69d76ea7d952d81f0d9f8
font_01_sfnt_off000158d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D5 11784 bytes
SHA-256: eba60641bab59674a64ff49a46e824b09f28eb2f845d66ad25b737392db9e70c
font_02_sfnt_off00017fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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