Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d58754f1afcc27c…

MALICIOUS

PDF

79.8 KB Created: 2021-03-02 20:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 626cbce31fe00ab3b232f5301ad19e91 SHA-1: c4eb972f7f61c88c283fa3b83ae4d680a4cf52e5 SHA-256: 0d58754f1afcc27c3c302296761c9e1c9cab9f9d8478f7d507c55013e9cd7474
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the malicious nature. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to redirect users to malicious sites or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=what+are+the+4+kinematic+equations+for+physics PDF link annotation
    • https://cdn.sqhk.co/divabasom/hbVhjhi/50124942088.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumabigige/f7HbyCE/gusetezigatolibuneg.pdfIn PDF document text
    • http://pakupuxojopef.getenjoyment.net/zejibatesedetaka.pdfIn PDF document text
    • https://sudarixadozitot.weebly.com/uploads/1/3/5/3/135331315/dafebofi-genonefakisoma.pdfIn PDF document text
    • https://bowutemol.weebly.com/uploads/1/3/4/2/134234741/mugazome.pdfIn PDF document text
    • http://starkrobotics.org/tepegoxik3ite3.pdfIn PDF document text
    • http://marketitaly.info/neromuwaxizazasug671on.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/e933aa17e0bd5cb.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/TI95hgg/55666832477.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/keridije.pdfIn PDF document text
    • http://www.opentle.orgIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000eec8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEEC8 10272 bytes
SHA-256: 4a2e9d87536dcde9ed46a99b53742c14169a1d463d0b07c116fe45005252ee51
font_00_sfnt_off0000dbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBD 5616 bytes
SHA-256: e94055898c60049090ebb817df0efc6c19a9b08f6ebbdb870b00066099e4e06a
font_02_sfnt_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 11168 bytes
SHA-256: 2ef09887aaccb85c4f9a12b61c4e51bdc3d8faf72dd8469d3e6bd775ccff0c2c

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