Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d16a63acc1377e…

MALICIOUS

PDF

65.8 KB Created: 2021-02-09 20:03:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 26a5b45c5cde2375e6de28233b936cc4 SHA-1: 19fe7d4c18327bc9f022e0fa81967cfaf53ce7a0 SHA-256: c1d16a63acc1377eba0d35309931a1a8db502fd118b0b45b9e00375806e6b8ec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

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://maypoin.ru/wb?keyword=kaththi%20tamil%20songs%20%20320kbps PDF link annotation
    • https://gagakulusete.weebly.com/uploads/1/3/5/3/135326625/xabigabefulivemufin.pdfIn PDF document text
    • http://0fruits.space/30369831926i2lgu.pdfIn PDF document text
    • https://xikunozazoteta.weebly.com/uploads/1/3/1/4/131453294/zokizobi-vofiwuro-wezete-zejig.pdfIn PDF document text
    • https://vudujetejagug.weebly.com/uploads/1/3/4/6/134674723/5537259.pdfIn PDF document text
    • https://jikufowawuful.weebly.com/uploads/1/3/2/8/132814232/6152467.pdfIn PDF document text
    • http://fitokapss.xyz/pokiwovemodefudofa31oqi.pdfIn PDF document text
    • http://bevubexawaxuro.22web.org/airtel_tv_apk_for_fire_tv_stick.pdfIn PDF document text
    • http://ulekschool.online/bridge_to_terabithia_book_downloadqnx97.pdfIn PDF document text
    • http://trujillostacoshop.com/25172692464bsq2t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bikikifuxax.epizy.com/kukaberu.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/giorno_theme_sheet_music_alto_sax.pdfIn PDF document text
    • http://piredesoki.epizy.com/user_manual_for_samsung_smart_tv.pdfIn PDF document text
    • http://jatojitax.rf.gd/93575694959.pdfIn PDF document text
    • http://tixelupaninaber.rf.gd/missed_abortion_adalah.pdfIn PDF document text
    • http://vonupov.epizy.com/fikojujid.pdfIn PDF document text
    • http://fibalikirikoti.epizy.com/state_of_homelessness_report_2017.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_off0000c1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B4 5748 bytes
SHA-256: 2dcfe41151c71e3b7a408a729d75523b12509b65b55a10c14cb73120797acace
font_01_sfnt_off0000d51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 10560 bytes
SHA-256: b8a62854cebe9f9a6b5a1754100afd22e5c23f47065cab0f367a97eac0f94c28

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