Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8a75f05cf3e55d…

MALICIOUS

PDF

81.5 KB Created: 2020-12-28 05:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2dd24fc3cb40398e33ba62dd941e15b2 SHA-1: a73c11502dba5594056967cf2ff13ab9fbd6941d SHA-256: 5f8a75f05cf3e55d24524fb15ae1101e9a90ba1fe68492e7d5a0ac904ab35683
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a large number of external links, many of which point to potentially malicious domains. One critical heuristic indicates a PDF link farm, suggesting an attempt to distribute or redirect to other malicious content. The embedded URL `https://traffnew.ru/aws?utm_term=structural+reliability+analysis+and+prediction+pdf` is a primary indicator of malicious intent, likely serving as a lure or a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/aws?utm_term=structural+reliability+analysis+and+prediction+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421959/normal_5fdf490ccc1e3.pdfIn PDF document text
    • https://kozuxegibogul.weebly.com/uploads/1/3/4/7/134704263/69fd136f31048b2.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/gh1Thgf/nijumikomaxabogupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f99eb4852577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5faeca93876f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f996ed134486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_5f97200e3ac69.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/qZgcdlL/cell_wars_literature.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa0ca01-55c0-46fb-b0bb-629c3611b321/61591469046.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/succession_planning_template_family_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e023c2-eb66-4c90-a688-c3d0aecd49f4/xisirenirafumesu.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/instagram_blue_tick_icon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae9a35e-927e-4729-aee3-526fb5ca1010/63689629610.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 5496 bytes
SHA-256: 26f41cd3af0cd2e8bb05b3a50aa5de0b80aa79ae41187d7a391c0e532b9db6bf
font_01_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 12020 bytes
SHA-256: ebd31988ba1a4064b6b629bff3058dd4dd693415a05c27458be908e2a71bc6ab
font_02_sfnt_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 16112 bytes
SHA-256: 04c641d0aedeaa8c494855f42a2e9ae6fad9e3679126e7dc5c08fccc4b41c292

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