Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfae1155dd8e54a…

MALICIOUS

PDF

102.6 KB Created: 2020-12-16 23:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3ad9aa06f0ae3a9d1eab8aee32191c68 SHA-1: d903632d1a32916df4d33a13cb9f89a7aa61de5a SHA-256: bdfae1155dd8e54a9658986f29315cda839cf45efdbf3b9bb3239ec0792c48be
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ggtraff.ru/strik?utm_term=cognitive+behavioural+therapy+for+dummies+review In PDF document text
    • https://nukafezika.weebly.com/uploads/1/3/4/5/134510633/608310449be08.pdfIn PDF document text
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/652a270c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc6692c60f2895dc10d8c09/t/5fc7cd888c4551503fefc8dc/1606929802475/82725040382.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc52399ab79f442f2450564/t/5fc7b4484f9413233b2b09aa/1606923337997/expeditions_app_store.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d6c88787e879896ba956/t/5fc147f108845d0924b9a9fc/1606502385886/american_whitetail_broadhead_target.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/vasudowo.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/jezuturemidakeku.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc295c5a5bc066edfb0618a/t/5fc962d8ed280e32aa814e61/1607033561040/rope_drift_race.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6614eb9d-5c16-4001-92c2-e4c568ceaec2/92317606524.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eac55bcb0228a2828fa5/t/5fc936c41849bf380e3cc79b/1607022282377/telorigufita.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1b3b3085bf90c0e02b495/t/5fceab3793aac70b8078c952/1607379768666/defender_land_rover_price_in_kenya.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d7af3398ff75154fabb7/t/5fcf7bd9cd9a2056ff788422/1607433181352/73649021036.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015c73.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15C73 27120 bytes
SHA-256: f63458e91602193fce6b00f83db652449dc931574e1f203b58803ef5df6e6c86
font_00_sfnt_off000123d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D5 5752 bytes
SHA-256: cedca93a810385d8d3ea9acb73b7763a40d13bc45a6b91963ce3ad51a910862f
font_01_sfnt_off0001375b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375B 10900 bytes
SHA-256: 949e72a981139d8bb47c6a016ec074c00d86edbc0829e6d646dc5c7a6d4c7805

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