Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90d62020d21d25b…

MALICIOUS

PDF

87.0 KB Created: 2021-03-19 12:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 99a1090c8f3a670b601d6080d7b2cd08 SHA-1: 48fae6260b80a8e3afd8fb6fa1090be2515cea1e SHA-256: b90d62020d21d25be191517d91d8242c7308fce9649ae09a9a8d598fb4a23c27
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure for drawing random symbols, likely a pretext to redirect users to the malicious URL found in the PDF's URI fields.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/wix?keyword=random+symbols+to+draw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388413/normal_6044418c881c4.pdfIn PDF document text
    • http://zirosax.iblogger.org/how_reliable_is_relion_prime.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/gf1ajdD/5473602969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_604a519f8b6d4.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CKsihKb/40504930244.pdfIn PDF document text
    • http://seamanygau.best/5140979753554eot.pdfIn PDF document text
    • https://cdn.sqhk.co/gituxogud/fjidhhx/furniture_super_discount_san_jose.pdfIn PDF document text
    • http://obmenkalnr.online/jump_zone_trampolineo2wrp.pdfIn PDF document text
    • http://top-odejda.com/41978224937fxpis.pdfIn PDF document text
    • http://svoytrylend.xyz/mini_golf_100_level_35fjnsm.pdfIn PDF document text
    • http://mereravewesone.iblogger.org/differential_calculus_made_easy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388280/normal_604646b1e7a69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_604847733cd0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411935/normal_5fcde09614fef.pdfIn PDF document text
    • http://senenetikoxikom.22web.org/totipikuvufizixogu.pdfIn PDF document text
    • http://maroron.22web.org/vuduxaserumopu.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://buwopupewu.epizy.com/lisure.pdfIn PDF document text
    • http://tovajukoxeboder.epizy.com/vans_old_skool_platform_black.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/18202150.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/27349232877.pdfIn PDF document text
    • http://zenajonefi.epizy.com/diccionario_filosofico_rosental_iudin_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/create_word_document_from_template_vba.pdfIn PDF document text
    • http://fudinurozoxesa.rf.gd/reel_music_exploring_100_years_of_film_music.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_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 4932 bytes
SHA-256: ff2a85561b32f488529f3a28e8428e667df90cbf15af5f2a29a2e15eb74f2801
font_01_sfnt_off00011d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 10488 bytes
SHA-256: 88943226c3024e8a1fac87557027b53a3f84f4a21c6c938e8e8902b2ff8acb4c
font_02_sfnt_off00014093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14093 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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