Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc104084fa52b97…

MALICIOUS

PDF

79.3 KB Created: 2021-03-02 15:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8319762c6447517832f20d22fe0c6ecc SHA-1: bca32c15b8ad19122a7ded56ea03f5e8e444576d SHA-256: 8dc104084fa52b976cc833617d75df60e7e17b96518bbbc8751a07b5b57b361c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were extracted, the embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites.

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://baarspo.ru/123?utm_term=how+to+do+perimeter+of+compound+shapes PDF link annotation
    • https://cdn.sqhk.co/lekibefefu/jfjcugc/63130579623.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/hjdX3OG/76646083180.pdfIn PDF document text
    • https://cdn.sqhk.co/suwinodujeja/vjfjuce/youth_group_assistant_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/hbmnzig/dig_it_idle_mining_tycoon_mod_apk.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/balancing_chemical_equations_practice_class_8.pdfIn PDF document text
    • http://memaviwebepa.22web.org/bonixiwipeledog.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/7Xgh3hd/tajurumirevipuzi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469626/normal_5fdffcfb2ebc4.pdfIn PDF document text
    • http://puzofogerexiwi.22web.org/92768651434.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/susaroledi.pdfIn PDF document text
    • http://debodopox.iblogger.org/durawilefobiver.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
    • https://s3.amazonaws.com/teximikamukubo/happy_birthday_piano_music_audio_free.pdfIn PDF document text
    • http://nawabagaxux.epizy.com/traductor_espaol_latin_vox.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/ffxiv_leveling_guide_30-_40.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/23894603396.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/44739134953.pdfIn PDF document text
    • http://lepebelezoselob.rf.gd/vmware_6._7_patches.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_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 5296 bytes
SHA-256: f178c66740bdc286b22d9e9501c70f7d103d3c267d1e62e0d155fb22f5fbf79d
font_01_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 11048 bytes
SHA-256: 8b494aeb87c464f20649c534077bc2d1b9b4bbf08acea4d8974aafa2698cc6be
font_02_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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