Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a69ee29dc3bdda0…

MALICIOUS

PDF

73.3 KB Created: 2020-12-23 10:15:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d5076e2bf4b6dee97189221bd8dee770 SHA-1: 9b0b1387e624bd4d043a3bb8a3a5a37cedd5ab5a SHA-256: 0a69ee29dc3bdda0fb9e52a914d9dbe46681b3fec06ba1a84e1d2fb403743437
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users, potentially to phishing sites or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://trafficel.ru/aws?utm_term=catch+it+bin+it+kill+it+pdf PDF link annotation
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/zaxegatosukogab.pdfIn PDF document text
    • https://foxagizak.weebly.com/uploads/1/3/4/3/134332010/govin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495244/normal_5fd61c3760524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455196/normal_5fd66967d2b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5fd6b227eff45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_5fa161862c079.pdfIn PDF document text
    • https://dejesiviwusa.weebly.com/uploads/1/3/4/6/134688897/b9b7a074d93e.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/savifoporosufuvojop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f88db28a71d2.pdfIn PDF document text
    • https://felavonirevokod.weebly.com/uploads/1/3/4/6/134606430/49e6ca30ea9b41.pdfIn PDF document text
    • https://delevesep.weebly.com/uploads/1/3/4/3/134371082/1920840.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc6ca6faa0dc1643a2d2575/t/5fd6202f0f11661d4c23aa9a/1607868463863/xawurixavopigofibewusa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0df209955c744b53b696b/t/5fc97132fbf8976b723c33d7/1607037234915/poker_game_offline_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff1f2fd-f747-4394-8770-a999dd8a6d97/66126449041.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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 5080 bytes
SHA-256: b14e7e475166ee1aa246efc6f0dd7d38ca0ffba58442628a1b49474e693e3234
font_01_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 10856 bytes
SHA-256: cba7eefcce01baab4288b5c834624420cff584162dabbe310ae8a622623b5e61

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