Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a53bb079945c31…

MALICIOUS

PDF

74.4 KB Created: 2021-05-29 05:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d1fc0609946e8a6863fcc6c04660fc34 SHA-1: d98afc35ca308288ded30abb993e96c68d5702a3 SHA-256: d4a53bb079945c314c214b659bd8fee3b25fa149d9ea6ad0508cc0e16870a9a8
196 Risk Score

Malware Insights

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

This PDF file contains numerous external links, including a link farm and a redirector URL, suggesting an attempt to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/strik?utm_term=what+are+the+characteristics+of+newspaper PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417980/normal_6013df582bf08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427094/normal_603145c01f4db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410013/normal_5fcd26e5342eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380528/normal_601625a4ecfb4.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/kivazuzimamuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476780/normal_605906316db24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474220/normal_5fd6244e28575.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/kefedexuporepe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fc842211f017.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/0734b3db-ba48-4f4e-a71b-b0e5320e00ad/how_to_study_for_new_2021_pmp_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6300d313-0c61-4273-b4b4-d6953ea3bdd1/1999_jeep_grand_cherokee_owners_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba49ef41-26af-4c91-b56f-ddc177118512/wordly_wise_3000_book_11_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833c9a92-1ed7-42fb-a9c3-a5f58ed47534/which_lexus_has_best_gas_mileage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a768488-0455-4784-9ac3-1b9316e87889/73433621380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c700c6f-095b-4adc-bc9a-258fd83ebb3d/perfect_fingerstyle_tabs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52bc989c-639c-4875-865a-6354e9f0a7fb/sorosivuramanuxamujugomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10844d6-f858-44e3-8a2e-801ee9d4b472/what_is_coding_in_mechanical_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23787dcf-95f1-402d-853c-56ec5b7a79ad/magnetic_curtain_rod_for_door.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9ec0b2-f758-4521-8289-f0919e8bb52e/bugiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c5f8c0-7f24-4dd6-b22e-55862527826e/how_to_trade_forex_trading_212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5149cdcf-79ec-49b4-b7e0-b5d5d7e8e5fa/algebra_2_polynomial_long_division_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02d43c07-6bd4-4398-8efa-fa159dea7162/what_is_the_main_purpose_of_personal_essay_writing.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_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 5176 bytes
SHA-256: 8a49653e2780a50ed4899dfe7437139672fd84280bd90ca6bb99c5aea6177080
font_01_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 10976 bytes
SHA-256: 400c8d09f3177ff6af2b6992f736c77683f6a1aad4ae29d2bbf2eecd49f162b1