Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d7f850e0ba4da9…

MALICIOUS

PDF

75.7 KB Created: 2021-03-03 11:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2b4903bad5be45d5cce6c59c67447ca6 SHA-1: 329e73af5f4eaeb3abc3b03d0c436dbd16b8b461 SHA-256: 18d7f850e0ba4da97c9a0b8facb691f011517a70e00b6bd1dbdc9489767f6c03
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to a link farm, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a search query, suggesting a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=how+do+you+knit+a+hooded+scarf PDF link annotation
    • http://stankoff.org/koverazexiretofexiydsg.pdfIn PDF document text
    • https://noxitituruvid.weebly.com/uploads/1/3/4/9/134904787/6727330.pdfIn PDF document text
    • https://cdn.sqhk.co/tojofelekob/ChechhN/64283493272.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/74565230314que42.pdfIn PDF document text
    • http://vengriya.space/nand_and_nor_gate_as_universal_building_blockx9j5f.pdfIn PDF document text
    • http://summerita.fun/carroters_grinders_manualq790x.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/kosabujasogupejubiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_600bb0d68ad13.pdfIn PDF document text
    • https://fovezifume.weebly.com/uploads/1/3/0/8/130874198/104da5e9985b.pdfIn PDF document text
    • https://litaxavuve.weebly.com/uploads/1/3/4/8/134848922/zufofijoxada_wadofujo_duzobusevavi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5ff148473684d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372753/normal_603bbd3c950fb.pdfIn PDF document text
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/simare.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://penoputibilexo.rf.gd/13847183902.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/42148309858.pdfIn PDF document text
    • http://tadegapilu.epizy.com/what_were_the_major_causes_of_the_french_revolution.pdfIn PDF document text
    • http://mamuzov.rf.gd/51194420928.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_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 5296 bytes
SHA-256: 85fa6ab36ab20a1468db6b125661b8c6fbbc468f37e20eefcae3da2d79f0f567
font_01_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 10176 bytes
SHA-256: 4e112be39427e1f9ef9e3faadd3aa71b6b36496f75a5952872bafd6362c226c0

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