Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4f30d1d7a9b29c…

MALICIOUS

PDF

78.1 KB Created: 2021-03-31 01:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a27ff3fa407e91a98b2451766992ca09 SHA-1: 119ed50571d940ec17170c8a94ecfc5ba628eb67 SHA-256: ec4f30d1d7a9b29c79ac5301302b79e662cfad6b673be7b31cc1912675e70c41
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=language+files+12th+edition+answer+key PDF link annotation
    • http://qupieasy.online/94275497417q0z2a.pdfIn PDF document text
    • https://kowirakixodoxe.weebly.com/uploads/1/3/4/4/134467502/2121717.pdfIn PDF document text
    • https://faxakitowe.weebly.com/uploads/1/3/1/4/131437357/dimar.pdfIn PDF document text
    • http://idealica-ordina.site/jusupazujagaluwb7c8r.pdfIn PDF document text
    • https://kekuxepepave.weebly.com/uploads/1/3/0/7/130739312/7010635.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/dijihx5/nigerian_gospel_worship_songs_2020_mix_mp3_download.pdfIn PDF document text
    • https://sewidilegewe.weebly.com/uploads/1/3/4/8/134883142/7396882.pdfIn PDF document text
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/woluno.pdfIn PDF document text
    • http://tavafotuzefox.sportsontheweb.net/zejatebuvaxajimuziniv.pdfIn PDF document text
    • https://cdn.sqhk.co/tusujoxaseru/dhdqvBC/wilazozug.pdfIn PDF document text
    • http://fortuneocredit.com/tubebofumutesuvenovibrmsdi.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/0ae42d67-f62d-4308-adf0-5303b4474656/funny_family_feud_questions_and_answers_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18dd615b-ea56-4914-abe2-c73e2dec07d8/lijetubidinususonotab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d1b768-3fc6-470f-9d1d-eef986614ef2/how_to_replace_batteries_in_a_craftsman_garage_door_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a238c09a-adf3-45a4-9b23-38fd15c64ed6/minn_kota_ulterra_80_us2-60_w_i-pilot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d05a5792-48e3-49ad-9d0d-42d589347e5d/d-link_dsl-2750b_configurare_come_access_point.pdfIn PDF document text
    • http://bilofudako.onlinewebshop.net/wujujekag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e18d56-44b3-4e44-abb6-06f3bf2d5410/stranger_in_a_strange_land_chapter_summary.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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 5552 bytes
SHA-256: 5ca435d90e473bc620a4655ce0b72ffb2388c478882546e26c98536384b2e5b7
font_01_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 11104 bytes
SHA-256: 57a46c79037bb3ece2a24c9fc0bb9379fa242f87fac61100b00dcdc89d6ec639