Malicious PDF — malware analysis report

Static analysis result for SHA-256 63386104659e2d36…

MALICIOUS

PDF

73.2 KB Created: 2021-02-25 10:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c5a02b4dead973fdf4e868ce15d8cdef SHA-1: 98817f57d27bbc1c5ea0b10826db8f5f0da35150 SHA-256: 63386104659e2d362e1a0e082ecf2abb5790909d4c4324190260eb8ce52e4729
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://leonvi.ru/aws?utm_term=setting+rip+curl+watch+time PDF link annotation
    • http://thecaffeinatedstudent.com/efectos_fisiologicos_de_las_auxinasee12s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494146/normal_6031ad16090fa.pdfIn macro / runtime command snippet
    • https://static.s123-cdn-static.com/uploads/4461766/normal_5fc9d7efa6918.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/73108c5ec23ac.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/maxolodiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494451/normal_5fd876afb4af7.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/bowuzitim.pdfIn PDF document text
    • http://mebel-albero.ru/how_to_trigger_point_psoas48u6d.pdfIn PDF document text
    • https://mikatafa.weebly.com/uploads/1/3/1/3/131398449/9616f99c6d7048c.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/pikilasavo.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/71459054190.pdfIn PDF document text
    • http://masterpowerpoint.com/samsung_rfg298hdrs_door_partsirmkx.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/how_to_use_ninja_kitchen_system_1200.pdfIn PDF document text
    • http://xeeewq.xyz/wizz_air_careers_cabin_crewtjd8d.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/69894409281.pdfIn PDF document text
    • http://homebig.space/free_floral_printable_calendar_2020winzd.pdfIn PDF document text
    • https://donelodef.weebly.com/uploads/1/3/5/4/135401433/dazalezatazi.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/efectos_fisIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gumuwojurigab.epizy.com/8680145536.pdfIn PDF document text
    • http://pabiluset.epizy.com/utorrent_mac_2019.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_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 5364 bytes
SHA-256: 30e13de074ae8d5f4485b52b77adf28e6af8d311e1525b4e798733403ed1985d
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 10688 bytes
SHA-256: 8ccc6fd38d5d1e347be23683a9a1eeea8179d7d2c63e37332bd7c029419f2509

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