Malicious PDF — malware analysis report

Static analysis result for SHA-256 413adf1152b94ee6…

MALICIOUS

PDF

79.7 KB Created: 2021-04-07 03:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 88ef1c4f92365034eb715aeab9b6941e SHA-1: 3a7919ebb385ead932fa325211e253db93e86a61 SHA-256: 413adf1152b94ee6b28051a68a057f32f84b3682220c80a88bb4d19f459d4697
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of embedded links, with many pointing to external PDF files hosted on various platforms. One of the embedded links, 'https://crophysi.ru/award?keyword=states+of+matter+worksheet+pdf+5th+grade', is identified as a known malicious redirector. The presence of a large link farm and a malicious redirector suggests an attempt to manipulate search engine results or to distribute malicious content, aligning with phishing and exploitation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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.
  • 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/award?keyword=states+of+matter+worksheet+pdf+5th+grade In PDF document text
    • https://pekesasopalono.weebly.com/uploads/1/3/4/5/134505129/duwisu_fowip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_605a019a7fa1e.pdfIn PDF document text
    • https://tuzuxomewe.weebly.com/uploads/1/3/4/5/134527180/91144325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470972/normal_606602d137d89.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/igq2heG/59721189956.pdfIn PDF document text
    • https://folenepawesig.weebly.com/uploads/1/3/2/6/132680852/52ff00317.pdfIn PDF document text
    • https://cdn.sqhk.co/vomikigiw/hgRzhj3/zitavikumodino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469104/normal_60345095ea7c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_604029b390cc8.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/XjcuybA/53875924839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_6013dbfcb7f42.pdfIn PDF document text
    • https://terodovob.weebly.com/uploads/1/3/0/7/130776228/gutufoja_sovivimuna_xodakebixabedur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_4caadb7f92f744f0837e3591cc332756.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a980c70c-2454-435a-bd32-f7152d3c77e9/a_series_of_unfortunate_events_book_5_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dcfabc2-4b10-4b46-9f42-012da51b7576/the_bfg_full_movie_1989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78c1546-44bd-4d03-9e9f-364110ab9c63/walking_dead_comic_book_issue_100.pdfIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_3676ba954a2f4e3bb875db9fa40f903a.pdf?index=trueIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_2f79efa068fc41eb9c0c8ce26d6892b4.pdf?index=trueIn PDF document text
    • https://4d3f6715-1114-433d-a4b7-45a5e22e3858.filesusr.com/ugd/ce86b4_5efcdcf97a1c417a9ced529a1f81ac86.pdf?index=trueIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_e8604e1fd7cc4e3a8d44913bb03366bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c902708-39cd-4960-873d-44e405e29b3b/how_to_set_up_voicemail_on_panasonic_kx-dt343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a4b991-90a8-4287-a8a8-8ab83bc13943/reliable_sources_of_health_information_brainly.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_593aa11599904cada010b5e574a3c47a.pdf?index=trueIn 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_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 5808 bytes
SHA-256: 4b9d11c01fe70678284e144c4fd861c8409d8b1511acfce8308042f3aad307d9
font_01_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 2536 bytes
SHA-256: 7a1296bf1b5c0c251319c28a5b5f8740fd50036ae9d78573f598699f97e0a7fe
font_02_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 11652 bytes
SHA-256: f54b10a57e96b8b1dfe50b14b045f57421c757f95664d1caa6f8577b49ca676c