Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5981afbb3fed26…

MALICIOUS

PDF

75.1 KB Created: 2021-02-26 22:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1d7b44753496461951dd770fe5cefa9e SHA-1: be11d966429ec2e426b68c6bd5081218deeca501 SHA-256: 4f5981afbb3fed26ebf0872cea85937740daf4b24789c3d873ab76086ed662b6
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains and using UTM parameters, indicative of a link farm designed to manipulate search engine results or distribute malicious content. The presence of external URIs and the overall structure strongly suggest an attempt to redirect the user to potentially harmful websites.

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://gimoguvi.ru/strik?utm_term=how+to+make+study+guides PDF link annotation
    • https://cdn.sqhk.co/jotapepikota/sHggjhN/mlb_schedule_today_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/jde5bLC/zejawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_6015e746b68f6.pdfIn PDF document text
    • https://levukuwaxumofet.weebly.com/uploads/1/3/1/3/131383949/4192535.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/zutadavuged.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/hcSjaII/microsoft_sharepoint_online_login.pdfIn PDF document text
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/refol.pdfIn PDF document text
    • http://knitfqph.site/super_mario_land_2_dx_rom_online_colore9ris.pdfIn PDF document text
    • http://copyrightsupporteds.com/botw_bullet_time_bounce_tutorial6xll5.pdfIn PDF document text
    • https://bezubimuxidisa.weebly.com/uploads/1/3/1/4/131453869/degajer.pdfIn PDF document text
    • https://nazoxuja.weebly.com/uploads/1/3/2/8/132814973/xenoja.pdfIn PDF document text
    • http://podcard2020.site/34359124109ulf64.pdfIn PDF document text
    • https://jawoxufogor.weebly.com/uploads/1/3/6/0/136022219/pelizopi.pdfIn PDF document text
    • https://gogesixemaso.weebly.com/uploads/1/3/2/3/132302802/zapum_finibexalusatel_retuwinuweno_bejide.pdfIn PDF document text
    • https://cdn.sqhk.co/vimanagadu/H68qhf8/wozexafijomuxaxel.pdfIn PDF document text
    • http://workshop-fb.ru/70866895333xpiwq.pdfIn PDF document text
    • https://regamozinog.weebly.com/uploads/1/3/0/9/130969170/6415197.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
    • http://dezoruxeg.epizy.com/12th_marksheet_online_cbse.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_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 5012 bytes
SHA-256: 51bbb24786c01833fb336743073ba865604cd983ffd79c1f755bc007a664af34
font_01_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 10916 bytes
SHA-256: 21aa519d01663097f7840b76558abf77d8b4abd629444745d0d99648bdffc825
font_02_sfnt_off0001114c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2