Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b053498f53328b4…

MALICIOUS

PDF

80.6 KB Created: 2021-01-03 12:59:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 639a8175ade41a3481693a24d43a8036 SHA-1: ecfd7aa3c51f1d33ed89e5224c831708b95070a9 SHA-256: 4b053498f53328b4f576f75b0521f5b01a09926a595d54884a97056db74acef9
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirectors. This behavior is indicative of a link farm or phishing campaign designed to drive traffic to potentially malicious websites. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=monty+python+intermission+piano+sheet+music In PDF document text
    • https://zutovabofilosu.weebly.com/uploads/1/3/4/3/134333865/milizeb_dumasefipu_makakare_zadut.pdfIn PDF document text
    • https://tufiganifipira.weebly.com/uploads/1/3/4/3/134310976/aef969d9.pdfIn PDF document text
    • https://cdn.sqhk.co/mepofazobi/DWgi6hh/26750353900.pdfIn PDF document text
    • https://xukonixivuki.weebly.com/uploads/1/3/0/9/130969652/lofunelene.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/VMx4xDg/96204773248.pdfIn PDF document text
    • https://cdn.sqhk.co/xobitabab/Gyhijfm/rex_sky_force_3d_settings.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejeni/ekgdwtt/99594918403.pdfIn PDF document text
    • https://jazaxalik.weebly.com/uploads/1/3/4/4/134488577/9955626.pdfIn PDF document text
    • https://cdn.sqhk.co/dibigawila/xNgeAVe/tilituxuso.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/f0gcjiv/piano_keyboard_magic_tiles_online.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/6907811.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5fd07ab746660.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/igjdgiW/apod_nasa_full_archive_2006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_5fc37cf07c7b4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 5248 bytes
SHA-256: 08479e5b0bb7f1308ab92d95d0de809c71ed74f05b74ec2a386ebfc5928da7a4
font_02_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 15872 bytes
SHA-256: c17d791c160a7f75583f1f80b2f0513deac891952808a7c94cdfeaa9a12a0b02
font_03_sfnt_off00011de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 16120 bytes
SHA-256: 184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832

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