Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c007d5df9cefbcf…

MALICIOUS

PDF

72.8 KB Created: 2021-03-08 13:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1698520b1c95f71d70543e64496ff009 SHA-1: 21b371647b34cfa6f95c3424f17545aacd6f87fe SHA-256: 9c007d5df9cefbcff6eaea2851019cd50f90c7f7ab4709cfc41197d80147fe2e
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, indicative of a link farm designed to distribute traffic or host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://gimoguvi.ru/award?keyword=rational+functions+worksheet+with+answers+pdf PDF link annotation
    • http://boomerangoo.site/janopariganujivoz3gn3i.pdfIn PDF document text
    • http://vitogap.22web.org/murottal_juz_30_mishary_mp3.pdfIn PDF document text
    • http://fruits-summer.fun/58554537675iq0k8.pdfIn PDF document text
    • https://fizilotot.weebly.com/uploads/1/3/6/0/136050642/f869c1e47d74f.pdfIn PDF document text
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/8a0fa2.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/359572667970byxx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mulazukaga.rf.gd/besharam_full_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe49f245-ca35-4d72-8616-45783db30b52/1st_20_cube_numbers.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_3a79eff5a4ac45ddaa23530b6616ed4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a15c9ba-71dd-4a85-afb7-7b7ce5ce8236/49171138340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b00ff0c-58b4-4ab9-9758-16553f3d2152/84844624037.pdfIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_4fc2e4fef32e448eb23af77a15fc6ce6.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_ba6cd6b01a6c42cd9db6f55e5132cfb6.pdf?index=trueIn PDF document text
    • http://dogurof.epizy.com/30600238165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ec53ff-468e-4c1e-8130-25eeb198f2d3/how_to_handle_stress_interview_question.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_4d62a3ca07c24e019e5c1f426181787a.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_2c862447c7ee4340a2577c518062c656.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_204214813b524cd5913f4bd791a27257.pdf?index=trueIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_d298e352b3cc4749b74298115d5bca43.pdf?index=trueIn PDF document text
    • http://datasixiva.epizy.com/bl_blend_words_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f8c70d-2550-4aa6-a665-cb52ac60b3e9/aruze_slot_machine_for_sale.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_3c202605a09449b2873455cdc0b5e492.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_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 5404 bytes
SHA-256: e137d9bc81df8c2b7b641f83b3035933358c6d3faa4e46d5d626d4abfa1cf97c
font_01_sfnt_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 10044 bytes
SHA-256: d7f3d2e8228ca122dcbef6c4607fa4b8c52cff6b515195ec07910d42d835f7b4