Malicious PDF — malware analysis report

Static analysis result for SHA-256 307b986ce8700925…

MALICIOUS

PDF

73.7 KB Created: 2021-02-20 23:55:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 31d993cf21a81a40766e596eb360fce2 SHA-1: a1d953e3a7d19faf8f0599d68443416c139acbf8 SHA-256: 307b986ce8700925f17ce3971b009d697b2fadcc8364fa039f1584d85df54ced
184 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a known malicious redirector. The heuristic firings indicate the PDF is designed as a link farm on disposable hosting, aiming to direct users to malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

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
  • 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 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/123?utm_term=how+to+change+the+company+culture In PDF document text
    • https://cdn.sqhk.co/bijukipuj/SZhgpjg/repost_instagram_app_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxifup/b8djhud/27627990727.pdfIn PDF document text
    • http://gradstroy.su/99788391485i6397.pdfIn PDF document text
    • http://strahuemsya.info/20556733044bwkzy.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/jdihglF/tafomatudiluzi.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/jc5Vxia/buyback_offer_letter.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/zhjThbd/71428935570.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418993/normal_5ff096e21c721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372354/normal_5ffdb26812ca8.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/xisetajesamupamuxuiysw.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/ghjGtgg/xexid.pdfIn PDF document text
    • http://pitushok.fun/how_to_operate_a_rinnai_gas_heaterd8zly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_601e410a49e96.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/gdjiLb3/49146192722.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/fatisake/segolaxatop.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/seturiliv.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/isolated_footing_design_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/free_printable_alphabet_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/41543279535.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/kinixavitalum.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/10479394025.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_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 5324 bytes
SHA-256: af8c7b57b2a9f3d7353af4ea03fa0cf7ac04dbeb9494fe61f4bfaff577fb7674
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 10624 bytes
SHA-256: 02836073a1029032550451cff6fc84a291598ebd2c5440b5d27152a2efe18312

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