Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a016331e0e12a6…

MALICIOUS

PDF

81.2 KB Created: 2021-02-25 21:12:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4f71e0301cdf26612a5fb33f9840ab1b SHA-1: 382ce48136783e1ea77f2431cd494cdc0f711be3 SHA-256: 49a016331e0e12a63c93ebe59c4b167c994bfb1789a966cbcf64c5643d16641a
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=thousand+splendid+suns+summary+chapter+40 PDF link annotation
    • http://zesamoa.online/what_is_the_exposition_of_decameron1j3ui.pdfIn PDF document text
    • http://foyou.store/84810818677d3fgo.pdfIn PDF document text
    • https://fipuwetula.weebly.com/uploads/1/3/3/9/133997959/8cf8767425928a0.pdfIn PDF document text
    • http://xanuxitawunavi.iblogger.org/bagaf.pdfIn PDF document text
    • http://wide-mean.top/bogam7rlve.pdfIn PDF document text
    • http://copyright-notice-ig.com/rpf_book_download_in_hindi7qib8.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/taratuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/hgcjjgf/79052280422.pdfIn PDF document text
    • https://wilaruxade.weebly.com/uploads/1/3/4/8/134865150/5533726.pdfIn PDF document text
    • http://artelamp.store/xonazovi20fvm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gorevifero.epizy.com/d._f._s._c_full_form.pdfIn PDF document text
    • http://rowofasetadoxu.epizy.com/gadutitatowunurovitogo.pdfIn PDF document text
    • http://kusinusefi.epizy.com/14970981435.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_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 5596 bytes
SHA-256: 56ef29c6c1b45fe6ef93deaab3578aeb6c3af4c40cdf1979131b0d915a48c23a
font_01_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 10080 bytes
SHA-256: e87db0d2d44bebc27807e814fb149eba479f4948ddd099664a4997bbbb1e402a

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