Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd523367f0b89345…

MALICIOUS

PDF

70.4 KB Created: 2021-01-03 07:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 950438a6cee8a4c69ed1c219c36ed8f4 SHA-1: 9d3292ff0070dbb1d8f18a59cacd6e4ab4e9b8b0 SHA-256: fd523367f0b893459da5ea925e1de3b82b5f8afc51bdae4cf107f30210054e3b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. This behavior is indicative of a phishing or scam campaign designed to lead users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/aws?utm_term=dota+2+guides+not+loading+2019 In PDF document text
    • https://lebotisoko.weebly.com/uploads/1/3/4/5/134597635/261e231d9a.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/Ua3RZjd/btd6_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/bijininabex/n8CjijC/66501651164.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/nebegijonase.pdfIn PDF document text
    • https://didokizobu.weebly.com/uploads/1/3/4/7/134711826/lorazedixilap-wovenedewaz.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/gAifV83/anthem_of_heroes_android_to_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480891/normal_5fbc5763ac091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450511/normal_5fa7ca356ea8e.pdfIn PDF document text
    • https://nunodovov.weebly.com/uploads/1/3/1/3/131380210/a4ad5807e11e.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/uidtuii/69812278375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454055/normal_5fdabedd5e539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f875ad249435.pdfIn PDF document text
    • https://zufugorutamivas.weebly.com/uploads/1/3/4/4/134401118/lorenuxepewufe-nekulovekexe.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/iegfjdR/unified_products_and_services_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/online_translator_english_to_malayalam.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_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 5376 bytes
SHA-256: 3ea5e87fadf21c0fead1567062c6e8f23fecef55d38981f16f4268cbe47a307b
font_01_sfnt_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 10908 bytes
SHA-256: 90625bebc9977dd9ccd6c61cf49b5d467d4a1397c93f8889cfeb70a7f80cec16

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