Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b3662807a4b92f…

MALICIOUS

PDF

81.0 KB Created: 2021-04-19 15:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dfe933b7e9b72292637fe1842d85e669 SHA-1: 282456a1d77a77fb6dd0c350b251b4e7bb1975e5 SHA-256: e7b3662807a4b92f56d8dad7c36f315f612f17dafce9a1e204fc192a50c2d3f9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious sites. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The primary malicious URL identified is jumiwimov.ru, which is likely used for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=radio+samochodowe+pioneer+sph-da120 PDF link annotation
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469126/normal_5ff1dba322f3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477623/normal_5ff64a51e9711.pdfIn PDF document text
    • https://cdn.sqhk.co/tusenepobam/vjfKij0/past_present_future_tense_examples_words.pdfIn PDF document text
    • http://govnosiakxws.online/icd_11_complex_ptsdaksas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366343/normal_60003f9e0cfe4.pdfIn PDF document text
    • https://cdn.sqhk.co/sijaxovada/Qgd4Bia/19009094476.pdfIn PDF document text
    • https://cdn.sqhk.co/nogojexibawa/n75JHOx/ftl_stealth_cruiser_achievement_guide.pdfIn PDF document text
    • http://my-favshopc.online/quicken_print_optionsn2x7r.pdfIn PDF document text
    • http://souve.me/cesam_centre_de_formationbqsf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_fd2cfa1c322a46f385eacec59185debe.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_ecc49aaf2fee40a881e92abd96674948.pdf?index=trueIn PDF document text
    • https://321e46d8-a3e9-4523-905f-b0dcd1dcb7ef.filesusr.com/ugd/29fbc3_005aea811ff44f66af79cce7ff62cbbb.pdf?index=trueIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_c7a1a6a425754e778d562d35c7d400a8.pdf?index=trueIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_d086099dad044f3dac34b287c44eec63.pdf?index=trueIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_5196c84490c44c2e8dda73458c149ef8.pdf?index=trueIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_469a6bf1ba694f77aa80f3465ce9fb1c.pdf?index=trueIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_ada5fc78019b44729b40e35c492d106f.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_925cee44290044dd88ca84d4bab1c135.pdf?index=trueIn PDF document text
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_e37b39905e1949628f36e40a4374be5a.pdf?index=trueIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_6181dfb878944238bad8da3f76665de0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 5736 bytes
SHA-256: cc777c0665c33edbeb5b8b082420e5b4c4b77c76ff3e999643d3af1352ac1de9
font_01_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 13584 bytes
SHA-256: da525ae0eefdc22f2548d47626af3273efb57393a91f44bebdfaa518758181da