Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fccd94876e326eb…

MALICIOUS

PDF

76.5 KB Created: 2021-05-24 14:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0d0ae45fe5d474bf6a662a562201c96f SHA-1: dd7f4f17b78e341a8554060aa76191bd203f7233 SHA-256: 8fccd94876e326eb30f3c12e2c7eb2fa6208fb3a0cb2aa34521d39ff0ee39431
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://druttle.ru/strik?utm_term=graduated+cylinder+worksheet+pdf+answer+key PDF link annotation
    • https://babulavired.weebly.com/uploads/1/3/0/7/130775389/vegatiralawo_munitobiwa_gorifi_puluxet.pdfIn PDF document text
    • https://sujefamop.weebly.com/uploads/1/3/4/7/134762109/125645.pdfIn PDF document text
    • https://beluwunugel.weebly.com/uploads/1/3/1/3/131380842/junogigol.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/c3a6dfc9.pdfIn PDF document text
    • https://fotewusobowo.weebly.com/uploads/1/3/5/3/135339642/f81c199.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/pinogi.pdfIn PDF document text
    • https://xobuwepowitapim.weebly.com/uploads/1/3/0/7/130775805/sajidewofefet.pdfIn PDF document text
    • https://mikovenib.weebly.com/uploads/1/3/0/8/130813447/natawozuzusexet_genuk_ledafajig_sutik.pdfIn PDF document text
    • https://wutusexiradolo.weebly.com/uploads/1/3/0/9/130969471/kuvito.pdfIn PDF document text
    • https://pirizujimo.weebly.com/uploads/1/3/4/4/134454944/xajisimo.pdfIn PDF document text
    • https://rozinezo.weebly.com/uploads/1/3/1/6/131636990/jojage.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/dubogot.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/3b194688-d233-4301-bb59-c281d352ecbf/wd_my_passport_ultra_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11977f4b-704d-49bb-9715-932246e488b3/would_you_rather_questions_for_teenage_girl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77022818-7647-4ce5-b210-78c60a16705a/smart_wristband_4_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/40929999708.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/2584103730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d208d4-a5ce-4247-9bf8-fe78a4666f90/final_fantasy_vii_remake_pc_emulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/834ad3d5-6073-47f8-81ae-9fe709726058/visio_2013_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ac4611-9a80-4cf3-912a-1c27d802f8af/xexiridowal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/275f127b-48a0-4a15-b0c5-98be11cbbd78/how_to_light_up_a_furnace_in_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0498d3a8-5934-4435-bc2f-2bdc7c670720/how_often_to_ventilate.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/11110626848.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_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 5532 bytes
SHA-256: 9f354ea2b55106cf12ddc575bc82fe69f6d129a44bc56a2fa3b3cbd492c3a4c6
font_01_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 10244 bytes
SHA-256: 9fc9dbb5646ae7e43d28c83739a0d8bfe1f09f491f91b92d51b707327d7213cf