Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03a247659dd9e74…

MALICIOUS

PDF

76.7 KB Created: 2021-04-06 22:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 42dcc40ac1406edcdee299266654ef19 SHA-1: ea85c1503a45b8e9d2fbf02067b024a6080717f2 SHA-256: e03a247659dd9e744a874be4205c4d8ef8c7669e97d39d06f420072c3f2e6d5b
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 0.9995

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://golowaki.ru/strik?utm_term=libro+manual+de+carre%25C3%25B1o+para+ni%25C3%25B1os+pdf PDF link annotation
    • https://cdn.sqhk.co/juxezijafoz/ggieEkt/fortnite_world_cup_2020_standings.pdfIn PDF document text
    • https://cdn.sqhk.co/jujuziwe/cidieOr/vip_amma_amma_ringtone_song.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/a2gihcx/78667499321.pdfIn PDF document text
    • http://lesantyqas.online/focus_pro_6000_installer_setupyrmbv.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/iieL3i0/the_light_phone_2_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/kokowoxiwi/QdBKpgg/19138366407.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/agfhjpv/88867111800.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/YjajfhK/arabski_drift_rowerem.pdfIn PDF document text
    • http://ezfix.asia/46866475597e6c7d.pdfIn PDF document text
    • http://daating19.site/tujudafevoluvotezevaffdq8f.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/gjpighg/python_2._7_9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/gojuzujalunujuw.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/82677505216.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_15857c8f772c49dba7a017589b20b267.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_70978263f3694f40be5c252075cd9f4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupoti/seek_thermal_camera_android_app.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_2efbf3cfa72c4a45a4cb9598b7f5b900.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/dixasiwigikumalutavi.pdfIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_1c3393cef3af4a17863325ec61f77be3.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_79c83a81b8134f0f9da1e0f3c3795787.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/15739035541.pdfIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_4b59d8ba01254deb96253b1c7e5b9e9a.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 5396 bytes
SHA-256: b6e2998c9e44ceeada2d3a7a110f893577a39e023a95039f45a436d5d6dd732b
font_01_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 12184 bytes
SHA-256: 19bcd9b1181a3ec2995317bf8d77db1312876dc8b4aebd01ff403acc959d74ae
font_02_sfnt_off000114bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378