Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6e29116053082a…

MALICIOUS

PDF

67.5 KB Created: 2021-02-11 11:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 031151418536d82401c036f83eb15bb3 SHA-1: 2dc54e4715d7870b1f1e195622af44aa5f01d185 SHA-256: 0c6e29116053082a8749bcbaee57c40bef772d842d4f81863f1194cfc1625119
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/123?utm_term=binomial+theorem+worksheet+with+answers PDF link annotation
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/xijekeziv-xotududakem.pdfIn PDF document text
    • https://dorijalasenotom.weebly.com/uploads/1/3/5/3/135327318/8819430.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/2076112.pdfIn PDF document text
    • http://yogistika.space/jakakasekwozz3.pdfIn PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/eb1cbd.pdfIn PDF document text
    • https://purapunebofo.weebly.com/uploads/1/3/4/8/134888030/1179594.pdfIn PDF document text
    • http://reestr.site/wow_bfa_cooking_guide33dd7.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/0hfRIhi/rechargeable_hand_warmers.pdfIn PDF document text
    • http://fakaripeti.xyz/xazebazezisitawopikb8anw.pdfIn PDF document text
    • https://pojirada.weebly.com/uploads/1/3/2/7/132741169/5a699ec320e8000.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/laradusa/activex_control_internet_explorer_11.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/96525780317.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/71587598512.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_off0000cdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC9 5132 bytes
SHA-256: e4be24a289729bf64dd563fe3033257bad061de45fa65e29aa2e10092bbfd8ff
font_01_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 9992 bytes
SHA-256: 3f8b7eca293c60ca7abaeb286be75c0d6fa83a0d74e5a0a220f2503e770077ac