Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc6fa8c68830ac0…

MALICIOUS

PDF

46.4 KB Created: 2020-10-01 14:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bda9fa08aef166aa735248be0ac1a472 SHA-1: b08f97de9f0298deed1c8241698e51902aa3a19f SHA-256: 5fc6fa8c68830ac01980d6a1be69327419c0550cc97f493d5128a24e022b235e
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including a known malicious redirector, suggesting a link farm or distribution mechanism. The ML classifier strongly indicates maliciousness. The embedded links likely serve to direct users to malicious sites or to download further payloads, aligning with a spearphishing attachment initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://cctraff.ru/strik?keyword=peter+atkins+pdf In PDF document text
    • http://zapixewu.neokymamessinias.org/uploads/1/3/2/6/132683209/jotevep.pdfIn PDF document text
    • http://nobixoki.isdcounselling.org/uploads/1/3/1/4/131454057/jovibuvivuvuwuxemaf.pdfIn PDF document text
    • http://files.sunburyhealthcentre-ppg.com/uploads/1/3/0/7/130776183/faa5ccee03.pdfIn PDF document text
    • http://files.diyprojectnest.com/uploads/1/3/2/6/132683330/zoxudemub-rajulipedetuput-seridej-kuxamitom.pdfIn PDF document text
    • http://files.photographybyemeliadeweese.com/uploads/1/3/1/4/131453924/kudez.pdfIn PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/jeredofipukojatinoxadowa.pdfIn PDF document text
    • https://site-1038358.mozfiles.com/files/1038358/xoxupifajesefe.pdfIn PDF document text
    • https://site-1037180.mozfiles.com/files/1037180/36313582717.pdfIn PDF document text
    • https://site-1036839.mozfiles.com/files/1036839/dufovovudag.pdfIn PDF document text
    • http://lidev.jenreidphotoart.com/uploads/1/3/0/7/130738799/c2db5e7d2aac.pdfIn PDF document text
    • http://fajububol.mtrageserllc.com/uploads/1/3/1/4/131407102/665293f11697.pdfIn PDF document text
    • http://jodajamo.frackfreefoothills.net/uploads/1/3/1/1/131163717/gisepuraxu_vixetog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000077a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77A4 5068 bytes
SHA-256: 2932ff385a105cf2ba779793e34b78dd762a78bf2f83118480efb38271d40ad0
font_01_sfnt_off000088f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F5 10924 bytes
SHA-256: 20f3bd41c086e468a48d6bdfe763020dac639c686af2675182ade6ebfb244d8b

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