Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e5bdcd68e60a79…

MALICIOUS

PDF

63.5 KB Created: 2020-12-16 19:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cd57708f2d5062cc1afd1aa8820a1b94 SHA-1: 96d42df3846860e8c6e96ca313df92e8e5bedf34 SHA-256: 62e5bdcd68e60a79604980ca346464e48fa86b6c5a5b497d2db11efd64bfa68d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://ggtraff.ru/123?utm_term=lindamood+auditory+conceptualization+test+pdf`. The ClamAV detection and ML classifier further support its malicious nature. The document appears to be a link farm designed to redirect users to potentially harmful sites.

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
  • 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://ggtraff.ru/123?utm_term=lindamood+auditory+conceptualization+test+pdf In PDF document text
    • https://garijonomiwobe.weebly.com/uploads/1/3/4/7/134711127/1a857b2.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/radeluduruj.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/wekusuko.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/zamus_xuzexu_sugufefulel_tedug.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/tisiv-ratinamosolireb-wawiwotes.pdfIn PDF document text
    • https://bidovakufizal.weebly.com/uploads/1/3/4/5/134586087/1485957.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/fegep_betulo_dorabono.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/neviwove/kumbakonam_vethala_gana_achu_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/bukhari_sharif_bangla_file.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/honkai_impact_3_theresa_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b92f4b9-9bf0-4068-8432-b11cfa1f0681/the_periodic_table_answers_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/comparatives_and_superlatives_worksheet_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88aaf85b-e1fb-47a2-8883-3d6d431b95a1/2599678949.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/lubadadixatez.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/95295924793.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/growth_mindset_worksheets.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_off0000bac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC6 5392 bytes
SHA-256: 7a1c391a292d47b12a025f75b3cc7d14890542948f686bcfd1cc0233c9da6d4c
font_01_sfnt_off0000cd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1E 10472 bytes
SHA-256: abeb29074f989bd51538a2e4dc2fe319e00f14af5df615b94fe3f5fcad1dcf6d

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