Malicious PDF — malware analysis report

Static analysis result for SHA-256 a112a422ea728496…

MALICIOUS

PDF

77.9 KB Created: 2021-03-16 07:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7aca0651c0e2a970f449e5fcdf3ef7be SHA-1: c2d9cfd41ff00cf452ce1ad5e82f1a8f8c75494a SHA-256: a112a422ea72849642ad33a3aa997b1ec2b9d44cc9df866c5924acb5f7d52f1f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. One prominent URL, 'https://dugedepap.ru/strik?utm_term=asus+rt-n66r+default+password', suggests a lure related to router credentials. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature, indicating it's likely a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/strik?utm_term=asus+rt-n66r+default+password PDF link annotation
    • http://fertpin.online/1528404854po1op.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_6033664693cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5fe7ea02a9212.pdfIn PDF document text
    • http://guzolupe.iblogger.org/how_to_get_a_food_vendor_license_in_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/mokopizel/HienjjW/star_wars_characters_names_in_spanish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459785/normal_60418d676410c.pdfIn PDF document text
    • https://cdn.sqhk.co/jexerigix/lvjevgj/57217439488.pdfIn PDF document text
    • http://wanebori.22web.org/lituvesejuborunuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/finizaga/hhicEij/67879675440.pdfIn PDF document text
    • https://piligerababuge.weebly.com/uploads/1/3/5/3/135324290/2734076.pdfIn PDF document text
    • http://hookup754.fun/vaikom_muhammad_basheer_stories_in_malayalam_free_downloadk80xi.pdfIn PDF document text
    • http://cpskras.website/juxevixw15h6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_6035a5e8c32cb.pdfIn PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/letir.pdfIn PDF document text
    • https://fabirakarag.weebly.com/uploads/1/3/2/7/132710689/219f455b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467612/normal_6006f0bae9c5c.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
    • http://sisogekolavisul.epizy.com/75382960043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0d0339-c4ac-4934-9869-76b680586f0e/saxon_math_intermediate_4_workbook.pdfIn PDF document text
    • http://silaworavolelun.rf.gd/maya_angelou_books_in_chronological_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc976ec-39be-471d-bd94-2289992ace8b/mawasizifoxoteb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/381fdaf2-bf38-4f79-9f6d-5b713d64e658/influencer_the_new_science_of_leading_change_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/745d9ad0-aabc-44f8-a2f6-297702e6dc65/dujusuzofevepunekomipemim.pdfIn PDF document text
    • http://xuwugufufokiti.epizy.com/kewisatezeriwu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 5136 bytes
SHA-256: 2ee4c0f9e6017da5b222e5c94a1cbdb0545e81c677de6ae671f146f1a89e55e7
font_01_sfnt_off0000f67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 10936 bytes
SHA-256: 22e0f68c79e2e41d11195ce9d9e2022804bc2475f57108acb64eb031db91dbd5
font_02_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f