Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dadf147972e649f…

MALICIOUS

PDF

81.0 KB Created: 2021-03-03 09:16:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7e8039d3b4281ef8735e2c3b393e8254 SHA-1: c5ce81b7107fbc37de9aa54064be1c820bbe7243 SHA-256: 8dadf147972e649f1c67e9f90d6b571b7a43bb1e68673a34a3830404d8a4abb5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/wix?keyword=frp+apk+android PDF link annotation
    • https://cdn.sqhk.co/fabozesemi/Hhejaay/rugikewa.pdfIn PDF document text
    • http://biolinkus.me/88104373109tcdnz.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/AtWAjeJ/sonic_the_hedgehogtm_classic.pdfIn PDF document text
    • http://nenodipemuxok.mypressonline.com/83789308853.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/proceso_de_investigacin_de_mercados_tursticos.pdfIn PDF document text
    • http://allerlo.xyz/zuserekatasanivexevpil.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/shoprider_streamer_fault_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/ghgflQY/free_cross_stitch_rose_patterns_to_print.pdfIn PDF document text
    • https://cdn.sqhk.co/detatakev/4X3jhje/puseko.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/idxgi8U/black_friday_deals_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/Jhfzidm/free_olympic_logo_png.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/32095356.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/penale/heliospheric_current_sheet.pdfIn PDF document text
    • http://guzumirofega.epizy.com/jujowopib.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/2258336485.pdfIn PDF document text
    • http://kileduf.epizy.com/whatsapp_status_saver_for_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/actonel_150_bula.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 4352 bytes
SHA-256: fd25e2746f0734adaad9dff2067120aeae40aa32b5163b4d50c3906a0aa39af7
font_01_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 10484 bytes
SHA-256: 55568a7edfc4aa5f80ecdefaee9e0c15db66834cfd688db4f97bca6f8ee50c30
font_02_sfnt_off000128e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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