Malicious PDF — malware analysis report

Static analysis result for SHA-256 3311f1d434e22fff…

MALICIOUS

PDF

79.4 KB Created: 2021-03-10 18:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 55103e565785b124bcbe1f18cc0aec70 SHA-1: d0735980f66d1546bf018cacf9adfd1c5bbb8cb8 SHA-256: 3311f1d434e22fffaed8dd7a9fea55c5a27e18a3158717846382c07fd92d5db4
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of multiple links to potentially untrusted domains suggests a link farm or redirection scheme to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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=certainteed+vinyl+siding+installation.+pdf In PDF document text
    • https://cdn.sqhk.co/dowepigakaw/DicmHqF/riwafalinovutawuga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375698/normal_5fc666fa311c4.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/O2jbhiF/lego_batman_2_dc_super_heroes_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/befulirawid/XeRnjag/kukuf.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/5gfiahd/jebinawotirotadez.pdfIn PDF document text
    • https://cdn.sqhk.co/letabuner/ialiaHD/prakash_defence_academy_haldwani_fee_structure.pdfIn PDF document text
    • http://lezojivabuxik.22web.org/94590209045.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480399/normal_5fffeb1949880.pdfIn PDF document text
    • http://netubekebusis.iblogger.org/91808496623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470832/normal_5fd7dfe59caa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5fd3509317d86.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/haihhdm/94166858114.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://uploads.strikinglycdn.com/files/248bbe97-5324-444b-bdbc-b7a032406e3a/will_there_be_another_the_5th_wave_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/how_to_use_brother_xl_2600_sewing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/how_to_smoke_a_roast_on_electric_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b550bfdd-bf3a-43e7-aa9c-67f6f0facdbd/3132744067.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/the_nag_hammadi_scriptures_book.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/orpheus_and_eurydice_short_story_summary.pdfIn PDF document text
    • http://masosoxejonejov.rf.gd/mogaledivugoxeriwipinuf.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_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 5212 bytes
SHA-256: 97d98171b36cab02de5f4a75f9fcb316eb38fefd186e211ca3cc5625d2e7b8db
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 9928 bytes
SHA-256: 9a2378eac0a3ae57a9d8481654e3ef7c5e01f49eef4a778f9e2e2b072a425c65
font_02_sfnt_off00012256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12256 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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