Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb55c4b503e978e…

MALICIOUS

PDF

102.0 KB Created: 2021-03-18 12:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eb23c0ff32cd97967d98ad16f243c45 SHA-1: 48ff3392511ffc5b11392cf56bdaba89cb77c8a8 SHA-256: 6cb55c4b503e978e2953e029fe0f4f2dc29810e61fae64c8d5d5ddb1166a46e2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used in SEO poisoning and phishing attacks to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=calendar+ortodox+2020+pdf+download
    • https://cdn.sqhk.co/fapiwejagiz/hdmuif8/boxhead_zombie_wars_unblocked_at_school.pdf
    • https://lalibirubifo.weebly.com/uploads/1/3/0/8/130873838/d51a70850.pdf
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/lodigomefafira_vixibiko_zipar_muwajuga.pdf
    • https://degewobajobazim.weebly.com/uploads/1/3/5/3/135324790/kazawikaw.pdf
    • https://cdn.sqhk.co/modajili/P0WZEic/tovugezira.pdf
    • https://cdn.sqhk.co/damapegapi/gdKhftu/cytosine_always_pairs_with.pdf
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/031b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f20522fe-cea9-4675-851c-330685ed85c2/computer_systems_analyst_class.pdf
    • https://b1d4f555-1eac-4d61-aa83-27206cf3ee4b.filesusr.com/ugd/1706f5_1d374190d579490f8d1fde895a179950.pdf?index=true
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_1fc165d1349e47699068b7a7641893ac.pdf?index=true
    • https://457cefd1-268f-49c0-9ca4-ced5ac281e6b.filesusr.com/ugd/983758_5880331f60674ad69d49f1cb38627551.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6cae1c59-a59b-4c6f-938e-d323706c26bd/how_to_reset_check_engine_light_on_chevy_malibu.pdf
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_8d25ebcfe6f240988bf9513b0221fd9a.pdf?index=true
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_5beda73241574b6a865cba18c66de979.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f952c145-38db-4904-b09c-e9935d77feaa/91452041766.pdf
    • https://s3.amazonaws.com/fapaga/cancriformis_grn_spanien.pdf
    • https://uploads.strikinglycdn.com/files/a34b40f2-ae4e-4610-a66f-c4eb8f4f7bb1/34642635751.pdf
    • https://s3.amazonaws.com/welanisowari/higher_ground_stevie_wonder_sheet_music_free.pdf
    • https://uploads.strikinglycdn.com/files/3ff3b52d-671e-4fea-98a2-5b10837b7288/4403232994.pdf
    • https://s3.amazonaws.com/xufaxoferugod/rojomapewejitad.pdf
    • https://uploads.strikinglycdn.com/files/e088fc1d-abe7-4e40-bbae-1be35d7c6e40/71559523767.pdf
    • https://uploads.strikinglycdn.com/files/e4ad1d8d-469f-481e-8a2b-fb1a85e2677f/bodyweight_workouts_for_legs.pdf
    • https://uploads.strikinglycdn.com/files/8d142066-a43e-4ab6-b0c0-47dec0cc7147/55851857341.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014001.bin
8e5ecfb84408a7369f2e22a5040f8c697bb517bf7bbe9648417322251b1292d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14001 3376 bytes
font_01_sfnt_off00014c1d.bin
c4eb9715021860599f75c3f5d9fd67724551168f8be81b2842cbb09ce5ab3997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1D 5196 bytes
font_02_sfnt_off00015deb.bin
2ce67fdd51d717015434c4ee9d99726fea7b6edba504a905b9ef48324636e823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEB 14104 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.