Malicious PDF — malware analysis report

Static analysis result for SHA-256 099ac85ea7f271d1…

MALICIOUS

PDF

69.3 KB Created: 2021-02-19 03:13:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0180a62448a6bb8a6e1b237e289ef2e4 SHA-1: d503199cf93b460f94008113de972a8a96ef4716 SHA-256: 099ac85ea7f271d1491875720233938d38c1e4dc6f4e554ba1b6703d3dd9fd9e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/aws?utm_term=calendario+dias+feriados+2021+gobierno+de+puerto+rico PDF link annotation
    • https://cdn.sqhk.co/kukisigafumi/buUu5gi/jawaban_brain_it_on_level_38.pdfIn PDF document text
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/1889150.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/hgiYhjy/bike_mayhem_mountain_racing_game_download_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5fd36d760dd1e.pdfIn PDF document text
    • https://cdn.sqhk.co/rapalaxob/hg5Tbqf/dojili.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/7664699.pdfIn PDF document text
    • http://mini-cam-v2.club/85066045156k2inb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504922/normal_5fc81557129af.pdfIn PDF document text
    • https://cdn.sqhk.co/dufubimaru/fjiSvWY/jenubizotabebutukuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376611/normal_5fdf37008b737.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/ij4gco1/3_point_percentage_nba_teams.pdfIn PDF document text
    • http://rolevuses.iblogger.org/angular_6_adminlte_template.pdfIn PDF document text
    • https://zuxidonav.weebly.com/uploads/1/3/4/8/134867872/96b4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buzepokeker.epizy.com/pogoxemulaxir.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_off0000cddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDC 5696 bytes
SHA-256: 75aaf9d970a1bb31559421dd57f0952026a138afaffa9d5771f03ecd16b1e4a6
font_01_sfnt_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 11284 bytes
SHA-256: d0ee6ac44f8e3360f8ee913c9e99dc428fb8431d2af0446728df09bc32747c77

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