Malicious PDF — malware analysis report

Static analysis result for SHA-256 12586bd2d5491eac…

MALICIOUS

PDF

66.3 KB Created: 2021-02-14 23:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 52d73049e62472b74bc2f75a7c668410 SHA-1: caceba05ea3716ff4346739c549ec06cec73abd4 SHA-256: 12586bd2d5491eac12a7f225becd45cd82e2da57df749c6434b082601074095a
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/wix?keyword=lesson+6.1+assignment+answers In PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/e774ef2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412584/normal_5fc70fedb6d11.pdfIn PDF document text
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/fenusazorerileri.pdfIn PDF document text
    • https://gavozosalaz.weebly.com/uploads/1/3/1/1/131163920/994049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446259/normal_6018e6f17857d.pdfIn PDF document text
    • http://storezone.info/elements_of_comedy9kh7z.pdfIn PDF document text
    • https://wumefabifu.weebly.com/uploads/1/3/4/8/134888429/juxetatev.pdfIn PDF document text
    • https://jukosixosibi.weebly.com/uploads/1/3/1/8/131871462/pemopipebunujigap.pdfIn PDF document text
    • http://5euro.info/11612478383o5az0.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/xekapuru.pdfIn PDF document text
    • http://nicechange.space/fox_nfl_live_streams588r.pdfIn PDF document text
    • http://baltika-trans.com/coronavirus_daily_briefing_today_ukqtiuy.pdfIn PDF document text
    • https://lopomibuliwipa.weebly.com/uploads/1/3/1/3/131381919/4504b78850.pdfIn PDF document text
    • https://regurawuxafedan.weebly.com/uploads/1/3/0/7/130740517/wirudanolo_jolasug.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/tasikosorumef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5fff97e818ffc.pdfIn PDF document text
    • http://astropsychology.site/14769854528r950h.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/jinabom/wimogurevisif.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_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 5244 bytes
SHA-256: 5ef53f80f6eb0b00e9d119da6a87c5c7b996705f4ff1a53ffff914dbd608575e
font_01_sfnt_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 10612 bytes
SHA-256: e5c76edf2095c8ebb4d4d8a0073d01c5a2ea5e4cd9ae9793413ea70bac2cd090

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