Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2feb2e2407bba0…

MALICIOUS

PDF

72.3 KB Created: 2021-03-30 20:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8379558e050749affbc1413dc4e7d3e4 SHA-1: 468810fca5008740099de48e5e3aa98698389cd5 SHA-256: 5a2feb2e2407bba00eb9c8a052bc6e3a0a7a313359fdb9bb0c630738d52e779f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users to various content, including software downloads. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

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://jumiwimov.ru/wix?keyword=spotify+premium+apk+for+android+5.1.1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374376/normal_5feb95c6745b0.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/i4tsgib/rpg_maker_character_sprite_sheet.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/23104992354.pdfIn PDF document text
    • http://yildirimotobursa.com/sword_art_online_alicization_war_of_underworld_season_2_release_date25bdb.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/hehrhjA/40484212007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_605795d6a25f1.pdfIn PDF document text
    • http://meetsucre.pro/sunovexelegufetimnl7mp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_604736d415d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_600f7b0109ee2.pdfIn PDF document text
    • http://vavazexowupex.medianewsonline.com/diwimevevijemowalipemepi.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/biosafety_and_bioethics_in_biotechnology.pdfIn PDF document text
    • https://cdn.sqhk.co/nevowokazem/hIgfkhe/lipili.pdfIn PDF document text
    • http://workshop-fb.ru/datasheet_capacitor_100uf_25vmjb0l.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/mBiiHxH/dark_blue_ocean_dream_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_60329032079f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478928/normal_602a10de92fb3.pdfIn PDF document text
    • http://recepty-dd.info/jujebaxejagezitokafimenfl3xr.pdfIn PDF document text
    • http://nomiwiturej.getenjoyment.net/datoregavutip.pdfIn PDF document text
    • https://cdn.sqhk.co/wagejino/Tjihchc/11185497924.pdfIn PDF document text
    • http://ihsteam.ru/vajasekosolegagebowbg8rv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 5452 bytes
SHA-256: 79d34ba232834a5f502aa9dc431c827113ed1fe1a747a9012d9202a470ffba81
font_01_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 11064 bytes
SHA-256: e60fe9999f4a7d144f2028de018a9ce61301444883cdaf9a65ccad6e12f6813f

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