Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2fc3fd8c345df6…

MALICIOUS

PDF

111.7 KB Created: 2021-05-20 15:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b319175ec35eabd055d7be08fc0256c6 SHA-1: b03e508eca9b44b418a072ba7b2e23ffd28b270b SHA-256: ba2fc3fd8c345df6e18260ff350536335a3d486e68f37a9c54714703b863f926
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/strik'. This URL is likely used to lure the user into downloading a secondary payload or visiting a phishing page. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=what+is+the+purpose+of+3+minute+step+test In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_60119eacdf68c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416131/normal_6053631b567f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tinezedu/45148746096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ca630d-1abd-4e33-a7de-55bc266305ad/list_any_3_characteristics_of_living_things.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2027754e-84a3-40b3-9b12-92400db4236a/wimukodiximajera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd1a35a-8ccd-4e1f-bb0e-93d2d8e6574f/77053314751.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/how_to_use_a_keurig_2.0_reusable_coffee_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999ae8fa-4544-4906-84b5-447de40be6f5/9100646642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27c73a1-4bfc-4b62-8937-9a18576044cd/21452789349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88dc263-46fa-443d-bd95-dddff1dca23e/lulidegozaradopadonux.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/2010_chevy_malibu_power_steering_module.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/talif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b50b92-75f8-42da-97eb-6bf58b6ba52e/dias_feriados_julio_2020_puerto_rico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c913687-be76-4013-b503-7e91793f10d8/martin_lutero_publico_sus_95_tesis_que_decian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3edc6ba-2650-493a-85f3-14d7353a16c6/26118607729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e50cc35-cca1-4a3e-8bf8-55d4cf230841/is_killing_floor_2_crossplay_ps4_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abf0c7b-85cc-46d5-8945-4b302c44b8ef/what_is_a_violent_storm_called.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/89611974955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a90d0685-83b7-4fe5-b972-e531f8326018/wilton_12_cavity_brownie_pan_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a8c9db-77fe-4f3b-96ba-d15bf6f874aa/29419269499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ac0511-70ee-4a74-be1b-3f3e7341fdbe/what_are_adjectives_adverbs_and_verbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da20957f-b013-49df-9586-56728577d3a0/12254307875.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AF7 5168 bytes
SHA-256: 6c532d302f9fd4e1cc45129eecc047cf05458b6eea6eac5aa99367d0373d447e
font_01_sfnt_off00017c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C6E 11380 bytes
SHA-256: 192d8f7b76d9350e150319c6365368a600362bf64233bbc7dd88c6b122b86543
font_02_sfnt_off0001a30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A30B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3