Malicious PDF — malware analysis report

Static analysis result for SHA-256 6421508ddab6fbc3…

MALICIOUS

PDF

75.3 KB Created: 2021-06-08 04:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b29da78dbe986557c2d9c7b2ea423486 SHA-1: c526a30222a901bbfbc2c5b8ed86809e62d88e98 SHA-256: 6421508ddab6fbc34b22719e0084cc30f10b416e2554d4c3580284ff83afc4b6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or other malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/pbw?utm_term=what+is+the+importance+of+the+nicene+creed+and+the+apostles%2527+creed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369783/normal_60661d99e68ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379030/normal_601a14e35320f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366623/normal_5ff15bbabe065.pdfIn PDF document text
    • https://baxakazakibabim.weebly.com/uploads/1/3/4/5/134585713/9792092.pdfIn PDF document text
    • https://gudugobaxav.weebly.com/uploads/1/3/4/5/134500737/9b7caf.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/a58567d41ba49b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446162/normal_6050babb51786.pdfIn PDF document text
    • https://nunesevafarub.weebly.com/uploads/1/3/0/8/130874378/lugosaw_zitiwezobased_mogobag_vurajinej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fd17367a2eaa.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/voxemewuguro.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/70d7769f-d9c8-4fca-9ff0-c152eead9f48/39131970910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24055564-b440-4897-8e97-5c70f3ed93e9/telecharger_attestation_employeur_destine__pole_emploi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8ec284-98da-410a-80d0-0f1c923107d9/what_was_the_primary_reason_for_european_exploration_in_north_america.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/465d325b-8403-42ac-87d6-281435b1802e/lomivixapona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd748ef-985b-4dac-b0a4-e359cce93e65/photoshop_learning_bangla_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/511e4c97-4346-421d-9811-77e2c3e27fa7/galepov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5846912e-614b-4e34-b2f9-12fea48d73d8/putidowijibona.pdfIn PDF document text
    • http://saxonax.pbworks.com/f/aeronautical_information_publication_aip_indonesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aca3bdd-a7f9-4374-b102-47bfa2ebde70/bujel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6abe9d74-0e10-4dd7-b3d0-d3dbd71f4a20/62264781393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec95db5-8d65-42c0-ac78-9ad8954a25d2/los_cinco_lenguajes_del_amor_gary_chapman_comprar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394f8cfa-e267-4fe6-998e-fbf8c5da3177/do_i_complain_too_much_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d5364c0-a46d-4e48-89b2-7e905e735d5f/lovogub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac8c6e83-e95a-47ad-8c02-d6099bb31196/sql_server_for_beginners_tutorial.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/f/darirevowomazopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e1be19-fb99-4a70-99a2-783067c64047/prepositional_phrase_worksheet_4th_grade_free.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_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 5440 bytes
SHA-256: b3cf908263eb35b730638a2dbaba2500d1fc413042a9f4a4455b8c777b052e9d
font_01_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 10460 bytes
SHA-256: d7b60dbb4b2fc2f56fb83f94c635736676cf8d2bb8542e884f505b5a25654bbb