Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b42114adb35583f…

MALICIOUS

PDF

80.7 KB Created: 2021-03-22 17:17:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 51d62f21665a7ef9020b94dad62dfe4c SHA-1: 214b59516a06826e2f068419611e7fb587a29de0 SHA-256: 3b42114adb35583f6631a56cb0a9ecb7d61ab6e34787ecf50483df06047e1d23
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 0.9993

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://kuzutuzo.ru/123?utm_term=reason+for+leaving+company+answer PDF link annotation
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/5679651.pdfIn PDF document text
    • https://zavinuso.weebly.com/uploads/1/3/4/4/134461772/65213464b9d334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_600c07e98b380.pdfIn PDF document text
    • https://xipidutaz.weebly.com/uploads/1/3/4/4/134401361/4450900.pdfIn PDF document text
    • https://bukajovogasis.weebly.com/uploads/1/3/4/3/134340533/nosulawip_vizofenigewux_vusajo_zememi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_602efa037b7ab.pdfIn PDF document text
    • https://dovizitozul.weebly.com/uploads/1/3/1/4/131408131/vunavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_6014c1aa5666f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490735/normal_60302afe32376.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_5bf5bbd78fe248adbbeeac3fea9a1054.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_2058a983990946578f9b05d380399e8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec2d245-49ff-4eac-a67c-e93acbf25448/their_eyes_were_watching_god_literature_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/auxiliary_transformer_manufacturers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44a979a-a42a-4a3f-ad89-6d7fd81763dc/fundamental_theorem_of_calculus_part_2_examples_and_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd2c346-1383-460a-a569-7fd12a9dbf9c/xajumenane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce36eed-ebeb-48d0-8a31-c078d0f67c07/27004252474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e27526-2f6e-42c7-8f03-60353cbc318a/pivetelisoxesixorogi.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/rikesoniwodoneravutaxore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7765d92-2672-4100-81d8-1fd8e978073f/accounting_made_simple_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f10df4-7850-492d-bc07-bc9c05180356/yoga_poses_images_with_names_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/44216195377.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/please_find_attached_filled_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13550a98-91ae-4980-8e33-4adc16be2c70/a_first_course_in_complex_analysis_with_applications_by_dennis_g_zill_slader.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/9765865414.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_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 5596 bytes
SHA-256: 3bac20dc5e4fbbab41dbf1dfade5fc3874e20a55c162bf65cbe5518f56183f8c
font_01_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 10816 bytes
SHA-256: 87806de25dae570c9235acf17c77080303e3b4dbe1a40863a07a2316f4f5010b