Malicious PDF — malware analysis report

Static analysis result for SHA-256 62660aef35c8610e…

MALICIOUS

PDF

76.9 KB Created: 2021-05-09 18:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2c9efc9279a20b4f6affeb0cafa4c463 SHA-1: 471503c5d1eefa7633972a80a2b213324c565dd6 SHA-256: 62660aef35c8610eb3e6abf061c5ae08f0e2f9ac0d27deb3634f3535386d6ab9
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 0.9990

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://dugedepap.ru/strik?utm_term=black%2527s+law+dictionary+pdf+4th+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366340/normal_6059ce1126aea.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/ihifVhb/rocketman_streaming_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490539/normal_6037588519e0e.pdfIn PDF document text
    • http://rasujipegov.iblogger.org/virofonesiwotalu.pdfIn PDF document text
    • https://cdn.sqhk.co/kifateten/difjeeY/81747692329.pdfIn PDF document text
    • http://jipuvojenibomig.22web.org/diamonds_and_rust_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_6061435066f4c.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/UjaHVhe/69632994938.pdfIn PDF document text
    • https://cdn.sqhk.co/sikereri/geggidL/64140635367.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455178/normal_5fce9ffcc1fa4.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/c5d302e1-6ebb-43e9-979e-8e2b9ecd789f/axial_scx10_ii_jeep_wrangler_accessories.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_2d624a7bedfd4b93a2f98f43129821a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/969882b7-918c-4eb7-8ada-0f774311cde1/36039225839.pdfIn PDF document text
    • http://dafawesag.epizy.com/icarus_verilog_linux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2867d69b-bc39-400f-84f2-f53cf10a7914/55997760844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e73b6d7-3bdc-44d6-8f20-9deef15f9c7c/list_the_14_books_of_apocrypha.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_7d321d5f0b484aac9df96bb79419d7c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c802448-d51b-4d06-9a4d-328a3842b240/76221768811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c31b17-416d-4cd9-9e02-196b592c9f67/char_broil_big_easy_turkey_fryer_smoker.pdfIn PDF document text
    • http://widafasamuj.epizy.com/50960693656.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_313b41cf18dd489fbb12c156e70ddfb4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0747c332-40d0-4c62-8c7f-768b4ec72600/14599618771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5aa9d7-6ef3-47d8-b903-e6b3534f9a42/gajuxigunuxeminavuxu.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_8976319168154816bb49cbe871f4bcb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14edfc26-456a-4073-a5f2-d9b2783319a4/python_sklearn_decision_tree_classifier_example.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_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 5672 bytes
SHA-256: 21bc093f5863713e0b25f6377c27f11be51574768d241f88d297a1e8d6468c86
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 10460 bytes
SHA-256: e2e83a95872a804ae40f8ac8a274b14cf3f2bdfbd29b4f3b25a6b40a8c076590