Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe06930441f4f15…

MALICIOUS

PDF

77.2 KB Created: 2021-05-22 04:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: df76184bdd9e42df554803f6955ce9ff SHA-1: 259e628d5b8f28591cae4e3a1e88429c7bdc2db2 SHA-256: 8fe06930441f4f15093421021957c95373ea9fe9c4148c302fe3b1c5dab3765a
154 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://crophysi.ru/strik?utm_term=changing+active+to+passive+voice+worksheet+pdf'. This URL is likely used to redirect the user to a malicious site for phishing or to download further malware. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, indicating it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crophysi.ru/strik?utm_term=changing+active+to+passive+voice+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_602a887e3ca20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_606c79094c147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_600dd1e5700f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527747/normal_6026eb17d312f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_605bfd34ee1f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_60216d2e4ccca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_6067df16231ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_603220295f242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500446/normal_5fcf0b7a10c4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_5fe9624975cd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/bobbin_case_montgomery_ward_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559bda44-e5bc-4dbc-aadb-7d2aeeeb7268/thinking_for_a_change_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/los_angeles_lakers_injury_report_update.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/anti_bribery_and_corruption_policy_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97fbee8b-a703-41c6-9a46-5080b81d6552/how_do_i_connect_my_facebook_portal_to_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/2411004468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/847d2994-bb2b-4005-a813-ceeb9c6bf9f6/gre_vocabulary_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/87404719379.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/54876688663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8e70bd-b175-42b6-a4d9-4ca25b76b4a0/alkaline_diet_plan_dr_sebi.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/bhagavad_gita_chapter_11_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/495b49a7-568f-46ef-bd62-30733711fa30/woliv.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_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 5504 bytes
SHA-256: a1e07cc21d9d7d2ae0e1c76171ffdddba6fa6b6c7772ca59c2a42e723028829a
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 10908 bytes
SHA-256: c72794fca6a74ff0f59b07a35fb547b8a2b3e1b2838d6c027cca6a7556163dd5

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