Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9eaf7f87545738…

MALICIOUS

PDF

74.9 KB Created: 2021-05-31 06:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b1e035a0c50ca31b1a85552cafc7091e SHA-1: 6a864b448b49bfb922989f70d1c7080f17760978 SHA-256: 1c9eaf7f87545738ea4d9b12f0d8c5f75e292d5e1eef794bc82a979c84bde9a1
244 Risk Score

Malware Insights

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

This PDF file contains a large number of links to external websites, many of which are hosted on disposable domains and point to redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to EBT card replacement, designed to drive traffic to malicious sites. The presence of numerous SEO-optimized PDF links suggests an attempt to manipulate search engine results or distribute malware through a link farm.

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
  • 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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+do+i+get+a+replacement+ebt+card+in+florida In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454299/normal_606be44e99f69.pdfIn PDF document text
    • https://logosomuzabi.weebly.com/uploads/1/3/0/9/130969340/liralifew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369664/normal_5ff26a14d8fb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480584/normal_604153f48d8e1.pdfIn PDF document text
    • https://buvujufa.weebly.com/uploads/1/3/1/3/131379824/6624397.pdfIn PDF document text
    • https://razavewi.weebly.com/uploads/1/3/0/8/130813306/bb7acc27cc6affb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fce9eb7762ce.pdfIn PDF document text
    • https://zetosodorab.weebly.com/uploads/1/3/2/7/132712291/5627715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_600d95837c09d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_6017806fd2d2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448121/normal_5fd12924b7d0a.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/punosuw.pdfIn PDF document text
    • https://zusavakaki.weebly.com/uploads/1/3/0/8/130815140/3434959.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/650b45a3-31bb-4c59-b6ee-54c9cb8a86ad/how_to_use_sap_system_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946ee6d6-afed-4219-af96-9a9ee6d97a8d/benovutebev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f7df9a-dba1-47b5-b85a-1efdaefd3b38/pogibu.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_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 5488 bytes
SHA-256: 55a0c9d54319ea421e4958c90a6b50a59226e5d04acdbc7ce351e416a46f015f
font_01_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 10208 bytes
SHA-256: bfc40a8f79f6f7d363abad13115fa939dd7b0d0ad6bc6a12e1fd655c34cc4aee

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