Malicious PDF — malware analysis report

Static analysis result for SHA-256 118500e0447c4845…

MALICIOUS

PDF

74.1 KB Created: 2021-04-14 22:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 581c63ed21a44fe3507b531ce3430907 SHA-1: aaf72ff339847a2ac9cc37644364120e149bfe56 SHA-256: 118500e0447c48458393a18681f4e19e62c36649ba1e5da1ad61ec574772cf12
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/strik?utm_term=is+ac+stop+leak+bad PDF link annotation
    • http://doordash.fun/kenwood_kdc_108_protect_mode5h19q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_60509e24b3713.pdfIn PDF document text
    • http://beliyden.xyz/1977_dodge_440_motorhome_engine_specsa3at1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_5fd1eb76d4848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_601330bfaaa92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_600f9dc64cc6e.pdfIn PDF document text
    • http://graatorama.fun/21993675172jjk38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d19aeff-12cc-4a4d-9629-347fcf14fdc5/islamic_dream_interpretation_friend_pregnant.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/76283515298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aabf385-0ad1-4870-959b-9e09f382dc00/hamilton_beach_toaster_oven_4_slice.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/fly_tying_equipment_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9c234a-973b-4cbb-95c3-c362a82e8a9f/zaxivawopegoruxiko.pdfIn PDF document text
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_18e9528addfe414a919e512eda75d886.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/neviwove/logic_of_collective_action_define.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_4d5bce59d9034f3380cb2963dbae6815.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f103ec5b-6974-4369-ae66-0770274e05cf/somewhere_over_the_rainbow_eva_cassidy_karaoke_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d84cf3-ce0b-4c3c-bb46-89acf9980051/what_does_jun_tao_mean_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbbfb530-8e2c-4b48-a4af-d9a7e73440f3/kesuvuvujixij.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 5112 bytes
SHA-256: 3fc64d4b629d28e712ed4f8a1f13544a0295fd1c114b1469983137feac17aa8d
font_01_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 10500 bytes
SHA-256: 5e03d00e0f39928bea0429878e6dc10de8bea3dc7b868b2e8937665fac3cc995