Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddc05eae1b124fd…

MALICIOUS

PDF

66.5 KB Created: 2021-04-28 23:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1b15f4f514e6139352b9079862ae0d4f SHA-1: df46c4965f32a674dfb1694bdeaa4f575ea647ea SHA-256: 1ddc05eae1b124fd434b6ddf61994fb8cbc3cf827dac702863dcc74d8549074e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload or phish credentials. No scripts were extracted, but the PDF structure and URL analysis are sufficient to infer a malicious redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/strik?utm_term=why+is+my+canon+printer+not+connecting+to+wifi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459059/normal_606c9d0e70859.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/why_is_my_amazon_prime_order_not_shipping_in_2_days.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382201/normal_5fc96c222882e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408984/normal_5fe600450642b.pdfIn PDF document text
    • http://depusapo.mypressonline.com/list_of_count_and_noncount_nouns.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_6068a678506b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_600a5d2bb4c30.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/lixikinuvogajagipamamef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473375/normal_5fcdc4f1e0907.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413005/normal_5fe125831c845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_60483dcf4eefd.pdfIn PDF document text
    • https://jomokojexenubi.weebly.com/uploads/1/3/4/8/134877089/ac7d13d6adb9a2.pdfIn PDF document text
    • http://vevebopawo.mywebcommunity.org/fopovowimu.pdfIn PDF document text
    • https://rekeboko.weebly.com/uploads/1/3/4/8/134899800/melolixuvazo_warumijurusogo.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/abe3d371-49de-485b-a2e0-c4aab7e62f43/latin_phrase_memento_mori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6eb95ba-591f-498d-9229-2ad8581c5310/what_are_the_types_of_dachshunds.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/po_bronson_bombardiers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a9a59ae-32ee-4f5e-a948-7446c5ec6e8e/46191091660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f55f5e5-b0c0-4720-afa5-2bfea29dbfab/addie_training_model_what_is_it_and_how_can_you_use_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f278e946-c50e-4c59-9ad7-826e4dd4cfbf/summers_heat_wood_stove_damper.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 5604 bytes
SHA-256: 3503d186f6837c4a74c7ffaa35eb4cd888f3ce4fac6520919aeab3dbd52a6351
font_01_sfnt_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 9508 bytes
SHA-256: e3eac4d796793e647642a96d4f4754b22631b413ce40691691e1ff84b9fdefee

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