Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a21c66babec88a…

MALICIOUS

PDF

73.0 KB Created: 2021-04-18 12:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a68b467a515187a4b87f8ec7cf186df0 SHA-1: 4948b3065b5e8426da75cd5a1e253bfed7ad5acb SHA-256: 09a21c66babec88a48882ed6983ace882bb6eb9f97b9090ca0db2fc50ac2bd50
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, including a suspicious one hosted on 'xezojetit.ru' which is presented as a search result for school bus routes. The presence of embedded PDF link farms and external URIs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/strik?utm_term=hillsborough+county+school+district+bus+routes PDF link annotation
    • https://kuwuxezito.weebly.com/uploads/1/3/6/0/136090431/133888.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/fUic3jr/netflix_party_alternative.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/6263328.pdfIn PDF document text
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/rekejekozod.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/ijfOhe3/hmrc_contact_number_liverpool.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/faxamomirazob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_a93cfa3bc10d4b0cbf876db1f29f331b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/android_auto_portugal_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/pokesubefipitujigakajigud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4427be5-39ef-4ca3-b3b0-a3b21db88946/how_to_tell_if_a_dryer_thermal_fuse_is_bad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb19b044-01d6-4733-a50f-f814a4c2cb48/what_is_the_electron-pair_geometry_for_p_in_pcl6-.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7412b184-1f5a-4bb9-a948-3618cdedb5dd/fun_writing_activities_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1882978a-6105-4053-bba2-3802feb02740/five_nights_at_freddys_3_game_free_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/above_all_things_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/056afdca-f10a-43af-be76-137a68ea7eac/vamezojanutimimonagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6cba95c-50f1-4b56-b775-1e09ea124336/47752907629.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_180377eff64e44b3b5947d26e64e0b0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/anaesthesia_for_cardioversion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e5fd98-fe49-4b39-88ed-97a0b7348c47/98121486198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b053eb8b-9862-40cf-97a0-9ee8b4e8ff66/tepebuwejarotexanavajor.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/android_save_bitmap_to_file_external_storage.pdfIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_d5d9276294e54a9d862244846f1489d6.pdf?index=trueIn 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_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 5192 bytes
SHA-256: f658ba73aa43453c487cf8d57d0b082b5f4254902af1831c36c5dd54e6d5f072
font_01_sfnt_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 10184 bytes
SHA-256: 9e46af5ae579384dc0824fd03672c1a59288101cfb9d1a8c07632f209b2c103c

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