Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ed35013a0f0f03…

MALICIOUS

PDF

82.5 KB Created: 2021-05-28 06:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e505da4c20027a28d510e242c146f988 SHA-1: 5745a2fefb0f1e660455e743bae0345631e256fb SHA-256: 31ed35013a0f0f034e0a34d73ec1dbe2e66d1ef29e1afe9baed67f041f209551
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 0.9991

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://jottigo.ru/strik?utm_term=what+causes+cankers+on+my+tongue PDF link annotation
    • https://bolafuba.weebly.com/uploads/1/3/4/6/134668532/goxipix-fuwiwedepif-minudapatoru-puniradovifigu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386605/normal_60046b783e06c.pdfIn PDF document text
    • https://bewimowijukoja.weebly.com/uploads/1/3/4/5/134584545/jazise_segedaxonetu_dediguxezu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369161/normal_600967e128f52.pdfIn PDF document text
    • https://nipizizit.weebly.com/uploads/1/3/0/9/130969905/ninif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_605fed7c29199.pdfIn PDF document text
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/715e49fb0.pdfIn PDF document text
    • https://fixivure.weebly.com/uploads/1/3/4/8/134888316/rudowuzet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_604af33c54f35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_60176ac1679f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_605867d7675d4.pdfIn PDF document text
    • https://befugusugub.weebly.com/uploads/1/3/2/6/132683140/sujetamosup-buxekekev.pdfIn PDF document text
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/lebeluxe_xamitudarof_zitupareponazu_logavowuwowep.pdfIn PDF document text
    • https://xalakadumikimam.weebly.com/uploads/1/3/1/4/131437423/9214266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482629/normal_60353eb9b22ed.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/fa5500a7-362a-44b4-8de7-4d8d75681158/stihl_024_av_electronic_quickstop_prix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11120c2f-609d-4a58-a00f-91fb351b863b/fire_and_ice_menu_boston_ma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9fc90e9-8024-4ef1-af17-43e1ee1401d8/20142668056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76479c97-7b7d-41a0-851e-b3f43dc21576/how_to_fix_water_heater_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac93a7c-f942-43b9-8b09-9d316a10d25e/lubavijurudulijowarojeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9127d2fc-4d09-44c3-bab5-deed0f171f63/chup_gaye_sare_nazare_dj_remix_mp3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae19b9d9-4451-4fe5-a5c5-f7215040f418/49782419193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc0fdca4-1dc6-400e-8b07-d64cc06ca76b/9901571233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34115b93-84c8-41a0-a522-054de852e146/the_last_song_soundtrack_download_free_mp3.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_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 5360 bytes
SHA-256: 9efbdde72539e816d49db4a65803b3b2c96b11d6eb5957581d47bd42fb6f0dc7
font_01_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 10768 bytes
SHA-256: 83350baa78950e371281046c3b76b3beec1eeb552d403f7a5697763227fa435a