Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa03e3b533cca89…

MALICIOUS

PDF

81.1 KB Created: 2021-01-03 13:03:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 157f3f98efb4c25c6c894e4e0bcb2935 SHA-1: 220a83e470fe9832f48cbf456370ddad942a26c3 SHA-256: bfa03e3b533cca890df4de1cb8fcdc9209829ad3fe567f844b0e55aad3c827f0
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?utm_term=ayurvedic+gujarati+book+pdf PDF link annotation
    • https://miletotafog.weebly.com/uploads/1/3/4/7/134758503/e44bcab58.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/37cf5f452e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485943/normal_5fe91f7ebadaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • https://s3.amazonaws.com/figugipopar/gejuk.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/11225243663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102109b3-3a01-4964-ad26-51a2825c46f8/takurimuxebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea53070-ace6-44e1-9d12-0f3983f74494/jininixujomademireb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485f6888-e254-43d4-a29e-62f872cfa54e/15450807925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee1572c-560d-43d1-a04d-8fc7a8b01b56/piper_pa_28-151_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f169ef8-a5d7-47dd-8b92-eab3888f1017/red_ryder_bb_gun_assembly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ce4da3-5f70-4882-a3a5-29c8d2a45e62/bibevarapezewizik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/062a29ad-9e6d-4d11-b0f6-85c42baa4a5f/driggs_elementary_school_waterbury_connecticut.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_off0000ce5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5C 5544 bytes
SHA-256: 38a72e772bb1313a214b864d19249d6adbda40841d8686f4985d37615f3ffb92
font_01_sfnt_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 8032 bytes
SHA-256: 384c9317598e85e38825991d0989b57778c2211fe4bc463dc440f8e67dd1c71f
font_02_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 11252 bytes
SHA-256: f761ba02aed5ce36280638d58bb57fbafb9efa65921b6492f93e1944bed07def
font_03_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 16172 bytes
SHA-256: 96e06106e3006553386fba87c243c4a28b622411f61b38071404873282de63a9

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