Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bf70c6b68f5e01…

MALICIOUS

PDF

75.0 KB Created: 2020-12-18 02:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8e547859b8f157e6cfeda2b2c6a21ffb SHA-1: 7bb837d71d4680b80b7becca44ce7bfafec1fc32 SHA-256: 59bf70c6b68f5e0171896e12e0413b31074282d8ea0fc7aecebe2743122ee90e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many of which are structured as a link farm, suggesting an attempt to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a focus on external resource manipulation for malicious purposes.

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://traffine.ru/strik?utm_term=posterior+tibial+tendonitis+treatment+running PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f988125358c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528915/normal_5fcbff651b7bd.pdfIn PDF document text
    • https://gikeviviku.weebly.com/uploads/1/3/4/7/134707445/nezas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_5fa96464d4d2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373508/normal_5fca7bc82322e.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/dazemi/burglar_s_guide_to_the_city.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc07be4-fec6-4318-a84c-fc5c10a233d8/gosowesol.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/79876511263.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/excel_2013_bedingte_formatierung_wenn_datum_berschritten.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/c_wpf_treeview_hierarchicaldatatemplate_datatype.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/geluzujatipenomufidud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7658cf7c-16c5-448a-a59f-7e40851dff03/tibosefiwedunogoruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ced1e0-2b69-45e8-b513-b1535ed9ec7d/desituximufapevosuj.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_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 5288 bytes
SHA-256: 9dcaa99840f783a080d7f9d841e6e36a06e510d3c7525c801d60ab742f725958
font_01_sfnt_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 10928 bytes
SHA-256: 6b97c564c83cce645efb6956650f7a0da2689bc5a3860687f9d2b1519775b0d8
font_02_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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