Malicious PDF — malware analysis report

Static analysis result for SHA-256 36161c56003a5bc6…

MALICIOUS

PDF

83.6 KB Created: 2021-05-31 06:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0267b2bec106bc73b3170037e4974b58 SHA-1: 265799293fd0ed42394d19f4666298c2ab4e1b52 SHA-256: 36161c56003a5bc6f5738870ee7a3c8e687613be19c3f941a1c59256a60df154
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and an ML classifier, indicating a phishing or SEO spam campaign. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/123?utm_term=borders+frames+powerpoint+templates PDF link annotation
    • https://xizavuxovom.weebly.com/uploads/1/3/3/9/133986710/ginerewobova.pdfIn PDF document text
    • https://kivoranove.weebly.com/uploads/1/3/4/6/134679810/noredopisagevo_dowumufag_pasosufusizolaz.pdfIn PDF document text
    • https://gizazegixewaner.weebly.com/uploads/1/3/4/5/134596748/gubomelowib_sedimuwovita_pipezofenes_tagusu.pdfIn PDF document text
    • https://safusugefivelu.weebly.com/uploads/1/3/4/3/134346528/6049375.pdfIn PDF document text
    • https://zafudibibini.weebly.com/uploads/1/3/4/1/134108698/5963369.pdfIn PDF document text
    • https://sejubapis.weebly.com/uploads/1/3/4/8/134887951/xisanaxin.pdfIn PDF document text
    • https://webutukokixomuw.weebly.com/uploads/1/3/5/3/135317122/muruzuxis.pdfIn PDF document text
    • https://jukuxalubena.weebly.com/uploads/1/3/1/4/131453985/bexurufipaj-zudatakeloru.pdfIn PDF document text
    • https://zuvimigiga.weebly.com/uploads/1/3/4/5/134586735/vexapor-vukiguge-solazu-luvumugavepak.pdfIn PDF document text
    • https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/9a71a3622d75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_603ea82d1d3c9.pdfIn PDF document text
    • https://tugivopufik.weebly.com/uploads/1/3/4/3/134348802/a6e15483404c.pdfIn PDF document text
    • https://tebadigizowi.weebly.com/uploads/1/3/4/1/134109241/6977735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_604cf448a062e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cafec0da-fa0d-4fdd-8aa3-9f59e85b4022/what_is_the_main_point_of_the_textbook_discussion_of_milgrams_obedience_study.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed6919d-4b4d-4b3c-a5de-f76a27d91bf0/msrm_us300_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15eba10e-7d7f-4c4c-8514-163a0574f87f/dell_vostro_1450_audio_driver_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd3eb5f-3520-4db5-8046-d778ddf997d6/software_to_program_motorola_cp200d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bdaadca-c4e3-438d-afb0-d2058398e05c/average_income_by_country_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/182704fa-f9ca-490e-89c2-69b088d3d64b/receitas_bimby_bebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/030fcf94-b78d-479e-a8bd-7d19049d7e99/womidowefibufezudabof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c27d485-7ab3-4168-98d5-28b98818f1fb/babys_day_out_full_movie_in_english_download_hd_720p.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 6568 bytes
SHA-256: 2ba6e0c4516ae528974428ab90d2fcb845e31fc6427c3681d976df34e50bf0fe
font_01_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 5328 bytes
SHA-256: c0bc5607c8596d28f7ee699ba5167c90f7d00243f3732520df95ad8e44f6ebf4
font_02_sfnt_off00011afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFB 11324 bytes
SHA-256: d76dded2ab4344d3f8be9088f408da43a12be357b020beecf7a79f1cba2fb6b1

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