Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a31f2103d194a5b…

MALICIOUS

PDF

76.1 KB Created: 2021-05-15 09:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f1afe9ebfc6e0ea18e86a4de86104490 SHA-1: d7e8d09302aee9f363f11462f7caa8baaf4ed38d SHA-256: 7a31f2103d194a5b7affef5e6fd43324a8f6b009402706a4c4eecf7dc79f4fe1
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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=asus+rampage+v+extreme+bios+4101 PDF link annotation
    • http://trackengine.host/3792731229ukatq.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/what_companies_are_close_to_a_covid_19_vaccine.pdfIn PDF document text
    • http://shtancircul.site/7898010714kjc69.pdfIn PDF document text
    • http://dezimazokuxulil.mygamesonline.org/vepiwu.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/homemade_reflux_column.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482636/normal_5fe251cde611f.pdfIn PDF document text
    • http://bimizuzi.sportsontheweb.net/xavepekin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477156/normal_5fe3c3644822a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5fccfa01518b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tiduro/romeo_and_juliet_2013_full_movie_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a08e9d-a85b-4daf-9489-494d2e7b6eb3/fender_passport_venue_series_2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/327ecb71-6a28-4aef-9e3b-c62a2fbe4c10/where_is_the_manufacture_date_on_britax_advocate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264c15f5-1437-4326-9647-e3e4b441d739/6263651380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55b9e795-eba2-4075-8362-e345d2f344b7/astro_a20_wireless_headset_instructions.pdfIn PDF document text
    • http://bodudenijijeb.onlinewebshop.net/foods_to_avoid_when_you_have_acid_reflux.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_c6454b9a019247a092ef1dbcc2ceebd3.pdf?index=trueIn PDF document text
    • https://14e2190e-1c7c-401b-bdd1-4e50d95f8180.filesusr.com/ugd/62a579_48203c3a6a8e434db5f859749f1c03a4.pdf?index=trueIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_50c6a616f44c46dda692c65a1c23ffe2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivamubug/vobisotilaz.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/how_much_are_blood_pressure_monitors_at_walgreens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a4ceee-a172-4b7d-bda5-a5b4ca9cb622/how_to_set_up_dish_network_remote_to_tv.pdfIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_83abca1b359a4839973d814ecc9972ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/76472237022.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_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 5648 bytes
SHA-256: 6e89725e153769b8a6a54e853d754c456a4f306d30619a79b2824d15c054e890
font_01_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 12184 bytes
SHA-256: 1f316bd7bcc1cddb35a1271846be72389f0a2504b685a86c765fae27f24dcc31