Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4208448a168c32…

MALICIOUS

PDF

73.5 KB Created: 2021-04-10 01:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fe710726fb105277b755703e8666b6d8 SHA-1: 13735780b141807cf33774d538cc3bf70a8d58ad SHA-256: 6b4208448a168c3249cd1a97e1ab27883b99c10c03e93a05c6f9e0e8f4a38f35
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=basic+drawing+tips PDF link annotation
    • http://damvglaz6.xyz/planet_fitness_freezing_memberships6wpa0.pdfIn PDF document text
    • https://sipexagugiresu.weebly.com/uploads/1/3/4/6/134607427/9a46adab3937.pdfIn PDF document text
    • http://prodson.space/wallpaper_free_download_for_laptop_windows_8s8qny.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/what_are_the_five_principles_of_evolutionary_psychology.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/sejakuxanuno.pdfIn PDF document text
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/pegorotoruj.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/dean_koontz_movie_intensity.pdfIn PDF document text
    • https://tisirobe.weebly.com/uploads/1/3/4/6/134699904/f1968d1.pdfIn PDF document text
    • https://rixonusoraj.weebly.com/uploads/1/3/0/7/130738646/menezosorodidefuvopi.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/ccc4bc27-b720-4bac-ba51-07be0f674efa/massachusetts_drivers_license_renewal_fee.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/macquarie_dictionary_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/how_long_to_see_results_from_5_2_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0b6ca7-ff4a-46a1-a834-b3c4aa15b35e/46491929472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce022aad-1a2b-4997-b977-8e57aa5c5fdb/jevomopemuzizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16546dd-7127-4d69-9a4f-919ff2acae75/bepufaxixiwava.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/wufonepisokifabaso.pdfIn PDF document text
    • http://jemileti.atwebpages.com/epidemiologia_medronho_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9eb560-cd69-4f8a-93ee-4d5d7522c6a3/1072831953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7444823c-2005-4b71-b03c-3fc4359e0d25/zokuxaxari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eabe651-8068-4ff8-963d-9d759e4e01e7/6595722388.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_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 5352 bytes
SHA-256: 8483b635b169395dfc04d491d4dbeed4be8ca3b86cf81ad62c815220878eed90
font_01_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 10356 bytes
SHA-256: f9ee9875628bca609c9bdfa9f1fc7a326bed447d5117bce2ad095c7343138c99