Malicious PDF — malware analysis report

Static analysis result for SHA-256 550fd1a6a62d0605…

MALICIOUS

PDF

91.1 KB Created: 2021-05-08 07:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0e21ec6137fc4247cf328bd7fe76c3fc SHA-1: 2016fc89871da7fd6ebbc686200eee3117f9e078 SHA-256: 550fd1a6a62d06050e6f9f4da9fb021699e9b1240ca3658ccdb1568e8c064e2c
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The PDF structure itself is also noted as a link farm, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=spanish+medical+interpreter+certification+arizona PDF link annotation
    • https://kagamufoxigog.weebly.com/uploads/1/3/4/0/134013308/2271ce9b3e88.pdfIn PDF document text
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/jetuwojibe.pdfIn PDF document text
    • http://titanovyi-filtr.ru/92117229128ijz5o.pdfIn PDF document text
    • http://tradestaroffice.com/taclane_kg_175d_operator_manualdpka9.pdfIn PDF document text
    • https://veforolafumokiv.weebly.com/uploads/1/3/4/3/134340642/xisuret_timazibune_furitanaba.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://mofobawosenej.mygamesonline.org/22275061112.pdfIn PDF document text
    • http://nipawifaxupus.mygamesonline.org/capacitor_start_capacitor_run_motor_wiring_diagram.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/tevepapefed-vidokasowibe.pdfIn PDF document text
    • http://gukevipagopu.mywebcommunity.org/tanurigaweli.pdfIn PDF document text
    • http://zozamowewideno.mypressonline.com/14026977980.pdfIn PDF document text
    • https://ranibifuvif.weebly.com/uploads/1/3/1/3/131381542/jewovo.pdfIn PDF document text
    • http://rapiwanijisage.scienceontheweb.net/16958620556.pdfIn PDF document text
    • http://pinerapidsrr.com/5438872760626kvi.pdfIn PDF document text
    • https://vovasodakujex.weebly.com/uploads/1/3/0/8/130874601/2335862.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/e604ece2-d2c7-4c52-b00f-f83ec8053564/present_perfect_exercises_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/zeloki.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/the_one_thing_oleh_gary_keller_dan_jas_papasan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d05be0-955b-4d2b-a503-4eb96d6dd886/gipogupawol.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/fifty_shades_darker_hindi_dubbed_download_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/sabozure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf3d8bd-078c-4a91-a7ab-43f4378db850/basic_biochemistry_books_free_download.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_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 5548 bytes
SHA-256: d79f3e2f5034cdf5564325cc14dcbb5e1ebf77e0eec4000d276fda4a450a3fd1
font_01_sfnt_off00013887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13887 11164 bytes
SHA-256: 3c7c932e0f8cc62f547196cfedba26d086ca9d9fe2962e3c474af16221506a2e