Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b41a473bbbc620…

MALICIOUS

PDF

80.7 KB Created: 2021-05-22 11:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d85b93e92f429e1e1bf729e45ad34842 SHA-1: 20e24c7a4f8fe74a2948d5af10524da4a5cc583f SHA-256: 28b41a473bbbc620e941c4ff798753c8d493259c7b39bc1c15bd0435ffa07ad3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware through the linked PDFs. The embedded URL `https://gimoguvi.ru/strik?utm_term=ny+nj+port+authority+police+report+overlay` is a primary indicator of the malicious destination.

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://gimoguvi.ru/strik?utm_term=ny+nj+port+authority+police+report+overlay PDF link annotation
    • https://sixofufi.weebly.com/uploads/1/3/4/3/134375841/jejetibijura.pdfIn PDF document text
    • https://navadajedu.weebly.com/uploads/1/3/4/6/134614390/493a593.pdfIn PDF document text
    • https://sodapovi.weebly.com/uploads/1/3/4/4/134494820/761ee6444.pdfIn PDF document text
    • https://kovozewiridudu.weebly.com/uploads/1/3/0/7/130738567/rutizoxe-purinem.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/borifekax_sibisabeme_rikomaba_semag.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/gefoxerog.pdfIn PDF document text
    • https://losuwasujiro.weebly.com/uploads/1/3/1/6/131637226/5a3b906a8d613f.pdfIn PDF document text
    • https://moxigowa.weebly.com/uploads/1/3/0/8/130814106/xavol_piketi.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/717a09b2-50f9-4a3f-9053-56209af27fb9/hunger_games_catching_fire_book_age_rating.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/74318030134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acff50cc-d1d3-4bbf-bbe1-d338e3611881/cannonball_adderley_mercy_mercy_mercy_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69165afb-c15f-4d59-9990-e6fccac2a57f/luvobakodepakifazusat.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/ionic_pro_turbo_ta500_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c3e1e7-5a08-4b5b-824b-dfea5e4e0ce9/23388794243.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/email_received_confirmation_reply_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e69d1b-dc7d-484a-8f6b-ec64dec701a9/a_writers_reference_with_exercises_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/754db73c-306c-4074-a775-afd9e151a04f/zelevazuxadefena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d68d5f-40a6-47f4-b4e1-7d2a4f5043e0/zugetitox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17010594-bfe2-4c5c-a94b-dc7c7fb31431/69890457402.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_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 5048 bytes
SHA-256: 7508f2edee204cf036be68566a7f4ae7aedcd136ec03a49c0de3f9d5840dd26c
font_01_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 11172 bytes
SHA-256: 6a7d5203ac8ed270da52b4d1d244df4faf8c1dd8d96b4085056aa99dd0ae8b4a