Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cf48d189660e6f…

MALICIOUS

PDF

75.5 KB Created: 2021-06-03 04:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a9fd4ce0172f5fd8afb3b9622471b4b8 SHA-1: 5071ee2eec1f8b1a7b345e8e074b5101b685f2eb SHA-256: 38cf48d189660e6f4fc2b99d2b6ef24a8b4f7bdeacd0ae09cbd8e56e02e09015
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the document body, which mimics search results, point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/pbw?utm_term=best+stroller+car+seat+combo+at+target PDF link annotation
    • https://rativebexatu.weebly.com/uploads/1/3/2/3/132302992/f22437c3db225e.pdfIn PDF document text
    • https://nidimojisojetuz.weebly.com/uploads/1/3/5/9/135962904/dibadatibejajagobox.pdfIn PDF document text
    • https://wexikapej.weebly.com/uploads/1/3/0/8/130874413/lanobenuxonoko.pdfIn PDF document text
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/9214420.pdfIn PDF document text
    • https://jijelejo.weebly.com/uploads/1/3/4/5/134590633/vunew_jetoxid.pdfIn PDF document text
    • https://batujesidow.weebly.com/uploads/1/3/4/6/134666028/6b1c60d805062.pdfIn PDF document text
    • https://vamewifajezik.weebly.com/uploads/1/3/5/2/135297159/f3aba.pdfIn PDF document text
    • https://kujafuzepod.weebly.com/uploads/1/3/1/6/131637430/1053659.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/a69b06f4-5515-453e-8d61-d7305586105a/15997098214.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/jufumaje.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144425163/backup_whatsapp_da_android_a_iphone_google_drive.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/f/gijedezofifip.pdfIn PDF document text
    • http://werinenimuta.pbworks.com/w/file/fetch/144530100/duloraf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bedd53-f683-46e3-808f-fb84da177949/allen_carr_easy_way_to_stop_drinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07686054-9bb1-4680-b45e-dc63cff5fe7a/the_silver_chair_bbc_watch_online.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/f/how_to_get_qr_codes_for_pokemon_ultra_sun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14cec93b-0898-4477-8d7c-5a11c3cf4b20/difference_between_laser_x_evolution_and_revolution.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144498090/kadijer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c740a0a7-b1b3-4cae-9dc9-b0975ec9b0d7/what_is_the_art_of_living.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/what_is_4k_ultra_hd_blu_ray.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144489087/48954224187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a0586a-800e-478f-b1b9-16e9ac5d4ee3/vowaza.pdfIn PDF document text
    • http://zuwofig.pbworks.com/f/75854368970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66c5b15-5efd-41b4-870c-aa27a850a9ad/razer_blackwidow_ultimate_2014_software.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_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 5308 bytes
SHA-256: dda399cf9750192c4ebc78160012a83932781319cbad042703e34a25066d672d
font_01_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 10620 bytes
SHA-256: 9beecf9f879dba0ebb3e990a8c1333c56f5a7c6c9f16fc1337ab2c53d1aed717