Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d28be4fe2834d2…

MALICIOUS

PDF

75.8 KB Created: 2021-02-24 00:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: de68d5119e29d88ab4cffc473abfd8d5 SHA-1: f8678c132ce17d06202911f4d0fd2131a69e0f81 SHA-256: a5d28be4fe2834d256c11076c7de19b73fcf216b51a91710eca0d3ba82c58d8a
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a website offering a modded APK, likely a lure for users seeking game cheats. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous external URIs, many on disposable hosting, further supports a link-farming and potential phishing attack pattern.

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://jacksth.ru/wix?keyword=the+sims+freeplay+mod+apk+revdl PDF link annotation
    • http://fortuneo.biz/anna_karenina_book_online6nhdh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454040/normal_5fdff5565d60f.pdfIn PDF document text
    • http://viwowiziboso.22web.org/flute_notes_sheet_music.pdfIn PDF document text
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/4647825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_6013924564c26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415937/normal_5ff7d6bf8036a.pdfIn PDF document text
    • https://radifepibonavu.weebly.com/uploads/1/3/2/7/132712096/roxef_puzurupo_satuvowapifemer_fidesuzik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_602e52d837270.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/paxunu/simplified_chinese_alphabet.pdfIn PDF document text
    • http://levowemorunob.epizy.com/albania_u21_fc_form.pdfIn PDF document text
    • http://roduteberilexel.epizy.com/standard_wrapping_paper_sheet_size.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/45105961237.pdfIn PDF document text
    • http://vivotes.rf.gd/28818784200.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/13792869878.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_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 5456 bytes
SHA-256: 4e338deccf8a6ec5f88daa1692a66703c014e27f046bc778661f577850bd24c6
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 10580 bytes
SHA-256: 6461ed08b4c56291534e90023dfa03de8c1d0abec702a7d954ff779f9bd4581f

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