Malicious PDF — malware analysis report

Static analysis result for SHA-256 4184fcc91e6a0454…

MALICIOUS

PDF

86.5 KB Created: 2021-04-08 19:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4804d1005b47b6e5478f21a1cfbcdcc4 SHA-1: 5801afde25c475fd8800a4a7a86512657b664828 SHA-256: 4184fcc91e6a0454798dafbf8dc016e533c265d2948ae31b5ffaddd824ec2c9b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though partially corrupted, contains a lure related to purchasing a used car, which is likely a pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/strik?utm_term=what+do+i+need+to+check+when+buying+a+used+car PDF link annotation
    • https://nokiziwevapof.weebly.com/uploads/1/3/4/5/134507241/tusowewevekalalomega.pdfIn PDF document text
    • https://kalaxokesipak.weebly.com/uploads/1/3/4/8/134888683/fufexuxosewutalu.pdfIn PDF document text
    • http://twitter-center.com/iron_food_items_in_telugutytus.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/duvuriwabolulenevik.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/filadawefowubo_tupikibire.pdfIn PDF document text
    • http://tricitysikhs.com/csrss._exe_windows_76ersc.pdfIn PDF document text
    • https://wekexobesunolo.weebly.com/uploads/1/3/0/7/130739288/27379b1e1f1.pdfIn PDF document text
    • https://ponejibuwefugep.weebly.com/uploads/1/3/4/8/134879986/dunowivuwubi_fopowilupu_kafaxomufunonaf_xitiloxaxuku.pdfIn PDF document text
    • http://gtomishebs.xyz/vugopakixevikotobovbld5n.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/gubuxa.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/is_parallel_parking_part_of_the_driving_testiugb4.pdfIn PDF document text
    • http://huaweistoreukr.xyz/5128197048l42mg.pdfIn PDF document text
    • http://flash-sar.online/587913204104gcgz.pdfIn PDF document text
    • http://tadolonelo.sportsontheweb.net/24151657131.pdfIn PDF document text
    • http://ita-women.space/wrecked_camaro_for_sale_in_ga4tpk9.pdfIn PDF document text
    • https://rijamukomebojo.weebly.com/uploads/1/3/4/5/134585881/wufunevizonaxis-jibunet.pdfIn PDF document text
    • https://wepizowo.weebly.com/uploads/1/3/0/8/130813330/migokaz_vajiniraweku_moduninofewet_guzov.pdfIn PDF document text
    • https://pugotadarasab.weebly.com/uploads/1/3/6/0/136094286/5819066.pdfIn PDF document text
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/3298876.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/8fdeb0da-38fb-4860-a26b-0252dfd9ceaa/61060192752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4befabcc-431a-4b71-b6f4-0252dc13c83f/55312145350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019e8026-a191-43f8-81a8-6f732e743a60/how_to_setup_elgato_hd60_pro_with_obs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1fdc5f-ab6a-4e8d-8046-1d0c88787f6f/joe_brainard_i_remember_audio.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_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 5580 bytes
SHA-256: 30ed6288f8376a9cbd80f5a97d9812587235d509f861b1a4a0cbf92332ca6c63
font_01_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 11404 bytes
SHA-256: 892b1887e58183bb0a352358c53f4cc874fb3eebc46fe94fc1eb389886adc0a9