Malicious PDF — malware analysis report

Static analysis result for SHA-256 776609318497e9ef…

MALICIOUS

PDF

101.6 KB Created: 2021-03-25 16:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 45fe8b4f06b4cf536fc1037017512c72 SHA-1: aa0f6878f65e1765489dcbead18550cd2431a72c SHA-256: 776609318497e9ef317caf7042376a52a8531bb64ff37f8c74c986e5f575ca7d
186 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of techniques used to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/award?keyword=polycyclic+aromatic+hydrocarbons+in+soil+pdf PDF link annotation
    • http://gubuxuk.scienceontheweb.net/46620387585.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/what_is_a_99_year_lease.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/bioethics_in_canada_a_philosophical_introduction.pdfIn PDF document text
    • http://resokipuga.getenjoyment.net/list_of_anonymous_meetings.pdfIn PDF document text
    • http://nuvemibopakukot.22web.org/admission_list_unilorin.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/f21a6f4a-5330-411a-ad5d-ad5d8050118b/1734-aentr_series_b_app_download.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_20516c416ca4414f8c87ac2880d5f89e.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_0daaba01ca424569b21bcf51431412b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de97254b-d1e0-4b35-a808-f804980b7c7c/how_to_use_elgato_with_nintendo_switch.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_4141fc62737c410db9023193885d86a7.pdf?index=trueIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_738d8c2d86ad4116809eae8939a04177.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_993aa1a2b72a46fb8a9b7e97d6314991.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_bec406775a6344b49bc0fbcd9eba1790.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0f6ac9-6d92-49ed-b1b9-03c7469b433d/onn_cd_player_radio.pdfIn PDF document text
    • http://jamadex.epizy.com/7907629362.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_776f376d806b43a2b4645650e15502cf.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_77775bc083eb4a7197899855b5fb2780.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1a1d0b-c3cb-4ba1-8f17-45984f47bbdd/13981658238.pdfIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_a441ecbb720b4df3b014c5ec34918079.pdf?index=trueIn 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_off00014db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB1 5640 bytes
SHA-256: f20e0bb22c7b1155ba10a44d6422370b70aa631ea3fbd3a32fcd0f7232466c58
font_01_sfnt_off000160bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160BB 13560 bytes
SHA-256: 65bc73ef71f1c4ab5ae74b8a08e610de8a41a38db74e5c291bf8e7bf1966cd5e