Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edb157b726eb7c8…

MALICIOUS

PDF

55.2 KB Created: 2020-10-26 14:05:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cec15416c436924fd042bc00a6113a1f SHA-1: 9384776c057e3e8475c65d8b35b7bcfac93493bf SHA-256: 7edb157b726eb7c883691832872e532619a064ab4be67cc8b849e60dbbbd5aaa
162 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=sitka+font+family+download In PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/ledarupije.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/sozusor-gofizulukan-pisobal.pdfIn PDF document text
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/fabf522f3d9.pdfIn PDF document text
    • https://tinalolovini.weebly.com/uploads/1/3/4/3/134371967/3ed48.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/77295b8f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gelawiweza/bangla_dua_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/answering_islam_geisler.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/protocolo_ii_adicional_a_los_convenios_de_ginebra.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/test_for_carbohydrates_experiment.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/story_central_1_student_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/clsi_antimicrobial_susceptibility_testing_standards.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/94548350615.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/pirapevexi.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/wopifamijo.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/24530263714.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/pezominin.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/93115228884.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/5407669148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00baf484-aa24-438f-bf4b-6109c9bb35cf/zitopobozerameli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3625ac9-af1d-4601-9b0a-a52e68de0bb5/homeostasis_feedback_loop_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2891a4d-abe4-4f1a-9a47-af58bbd05c32/79100388138.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_off000076bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76BC 4808 bytes
SHA-256: c2a3648aed5b16c0cea0cdac360eb0cc95ef83a6699675d2feb9d2f5926c0bcb
font_01_sfnt_off0000870a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x870A 10732 bytes
SHA-256: 733b69f70579c3dd45730c33671fa0ed69fe78f13c7e3131b5dd84e24fe1eae0
font_02_sfnt_off0000abb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABB5 16084 bytes
SHA-256: a3b8ae6cb61a975f1aaa3bdf1d75290c2750726bc6c8d8b6ec62e4e9f5cc9978
font_03_sfnt_off0000c06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176