Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c96e14d37da13f6…

MALICIOUS

PDF

100.0 KB Created: 2021-05-02 20:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d54205323856cdb6b95c9a421327c273 SHA-1: efa9abd0bdf2f46aa5fa730bc8d024e8674607ce SHA-256: 0c96e14d37da13f60bd75f9a4f27c3a9020c4fce05f9dc6423177ad96f10e629
166 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of a 'LOLBin token sequence' in the document text points towards potential command execution or exploitation attempts. While no scripts were directly extracted, the overall structure and heuristic firings suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+charge+mophie+powerstation+usb-c+xxl PDF link annotation
    • http://vobajujabu.mywebcommunity.org/fixesepa.pdfIn PDF document text
    • https://nuvawusop.weebly.com/uploads/1/3/5/3/135302159/pajumoxovala.pdfIn PDF document text
    • http://bebobez.22web.org/dubumokaparujezusamir.pdfIn PDF document text
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/xagumofirerog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488604/normal_6033ade599d1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458633/normal_60088f200f046.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/5649190.pdfIn PDF document text
    • https://cdn.sqhk.co/bivadudit/Tjh9JmX/11870067180.pdfIn PDF document text
    • https://cdn.sqhk.co/vemosoveveb/jxvWZFY/30_day_home_workout_plan_free.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/cMDicic/funny_orange_names.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/Ithhham/neo_geo_emulator_plus_roms.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/kajovawujavavuto.pdfIn macro / runtime command snippet
    • https://gidunixodon.weebly.com/uploads/1/3/5/3/135322071/rusatava_juroralul.pdfIn PDF document text
    • http://nikomodemudajo.iblogger.org/rerumutogonagelizof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_5fdb1581bf0fd.pdfIn PDF document text
    • https://cdn.sqhk.co/buzosefif/dQEigIu/emergency_sounds_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/igfijBI/nhl_playoffs_2020_bracket_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wivowutone.epizy.com/how_to_start_stihl_bg56c_blower.pdfIn PDF document text
    • http://dujawupiraxep.rf.gd/modified_bromage_scale.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_off0001393b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 5640 bytes
SHA-256: e9d370a0a602ac536e41f1b54bcc3eef647d45ac92a3a0f2f352c00862954e4a
font_01_sfnt_off00014c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C54 19832 bytes
SHA-256: 164d6001ebec05da3f1a4470f88fb8bfc1f45ae7a6fd258000e8f3b5b473ec72