Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd84c6db47122ae…

MALICIOUS

PDF

79.6 KB Created: 2021-04-01 09:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f0b8109e81c6462aa0a674a6dfa40bbd SHA-1: f4fabd7d310665ce09c6ca25f2b1396c3c818259 SHA-256: ebd84c6db47122ae9c2a11f9cc1b476cbffe9a42c783eea3d12ec44c91749167
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9967

Heuristics 5

  • 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 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/123?utm_term=free+printable+worksheets+double+digit+addition PDF link annotation
    • https://cdn.sqhk.co/gagobuniponi/RNGjgeZ/tazezufeladifofipezaxuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_600d8d338fda6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_603dde889c36f.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/gdUijja/kavubomujedarisevebovefa.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/the_coldest_place_on_earth_tim_vicary.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/93703312761.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/jcxcKt8/59649360108.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/xamuxafavulogisavifinita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488837/normal_5feb16272b8c5.pdfIn PDF document text
    • http://sopidemeleket.mygamesonline.org/94317527574.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/fhiRckY/tazitujekokazikav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_604b88b28efdb.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/always_hungry_ludwig.pdfIn PDF document text
    • https://cdn.sqhk.co/pufojoloz/Mgihbid/20143596393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_6049ca4861900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pedamodaw.onlinewebshop.net/jejani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd62497-67e0-45eb-8150-0daab8183132/florida_highway_safety_and_motor_vehicles_reported_of_traffic_fatalities_are_alcohol_related_in_2009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d282ce07-3ed8-4275-96d9-03a083fb3d26/basic_electronics_arduino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56274e07-008e-46c8-ae07-b98d4f1cd4a8/17983520891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84dc50c5-0a33-4119-a2bc-57812ef09368/wunodajerenovizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1478ee6-3fd6-45dd-806a-a15a5f37cdaf/39662057440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eceae4a5-d0e1-4200-a75d-9b62be2775cb/41655530302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d395b71a-d13e-4f5e-94da-5281197e531c/hp_officejet_7612_wide_format_e-all-in-one_printer_price.pdfIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/wiwelaliveritufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5615b7-4525-4fb9-aac3-149dcd6eded6/juxuwefazesamede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed095e6-6005-4431-b65a-2ad622c0723c/what_do_human_condition_mean.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_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 5472 bytes
SHA-256: a920bfeb4176b430989a59d207f88da9da8040cd3f30944f0510f7ddc04af687
font_01_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 11480 bytes
SHA-256: 441484fa025303e8294773db7934fbbdadc07f3584c4dec9c035e29999b656f3