Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2995740592cec5…

MALICIOUS

PDF

81.2 KB Created: 2021-04-09 09:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6cf077aacc323c1c39320a363859d3eb SHA-1: 5c49d931dd0f37dbd81be60f3c41326bfca0ee2a SHA-256: 7f2995740592cec5d40c3fcf00a891440cd4d99f57f756862718278ac2b89699
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. Several heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=taco+bell+taco+nutrition+facts PDF link annotation
    • http://fitnesspack.net/osmosis_jones_hebrew_subtitles33cgy.pdfIn PDF document text
    • http://pitushok.fun/mac_os_high_sierra_iso_bootable_usbq1k2w.pdfIn PDF document text
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/xuxakuvisel.pdfIn PDF document text
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/5592970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_604459626d644.pdfIn PDF document text
    • https://cdn.sqhk.co/wejuladuke/gIjaijc/aparatos_de_ortodoncia_para_nios.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/k7g4hhS/70825098090.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/aidykWh/jaxot.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/jiihbCl/40154451641.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/jlijiex/android_tablet_google_play_store_missing.pdfIn PDF document text
    • https://nuduvoto.weebly.com/uploads/1/3/4/5/134589614/jarofap-bezufofefutejab-nejovujaturegen-gulux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405181/normal_604cb354f15fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_605b1c962d9a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_b5d04852c1eb4e4ca88c87be8a57db3f.pdf?index=trueIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_938bbdbe7f754cef87feab0a9f7de1f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/how_to_simplify_a_rational_expression_calculator.pdfIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_3b9143d938f148f7939e6bfda7a16746.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/vivomexotetadulofiv.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_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 4964 bytes
SHA-256: 82143773ff3a81d6fa9f4a0c74c83e88390578cb661958453ead05191aab8d8f
font_01_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 10360 bytes
SHA-256: 6e0839b48db142da46a3acf5b8c46805ef2d102555ea48c6d0dff9ccaa23f127

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