Malicious PDF — malware analysis report

Static analysis result for SHA-256 8330af6d854457d4…

MALICIOUS

PDF

86.9 KB Created: 2021-03-30 18:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6536ea7f84f8e6154af64b40d81fa456 SHA-1: b3bf7c42cdcc4b3dca489fe9fe40abe9a3b5ac21 SHA-256: 8330af6d854457d47f9d1484393d62c1f7825e60ee643c00f23012a81973172a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, flagged by heuristics as malicious redirectors and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and embedded URLs are sufficient indicators of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?utm_term=icse+full+form+meaning In PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/ygHjjig/age_of_empire_2_unlimited_population.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/eL5Ij2V/savers_thrift_store_reviews.pdfIn PDF document text
    • http://instapriz.website/can_i_use_masonry_drill_bit_on_concrete2f9rq.pdfIn PDF document text
    • http://it50discount.pro/a_level_physics_cambridge_notes7g7ie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_605ce8c41093b.pdfIn PDF document text
    • https://cdn.sqhk.co/palevisi/jgiZhh2/pasikuwagujibidixazufazuz.pdfIn PDF document text
    • https://cdn.sqhk.co/gugexuje/zCvjgjc/mens_haircuts_styles_names.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/0hjiqQI/84509786338.pdfIn PDF document text
    • https://cdn.sqhk.co/fidegelotag/iiiijhj/77712175960.pdfIn PDF document text
    • http://tutavizukatafoz.22web.org/dfes_letters_and_sounds.pdfIn PDF document text
    • http://7lessons.fun/355448938641n2v0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5fff61dbcced0.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/aGpjHgh/fopipenatuvunugivowijuxi.pdfIn PDF document text
    • http://trysoda.club/has_honda_fixed_their_transmission_problemsvrqc0.pdfIn PDF document text
    • http://rokupaxag.22web.org/perimeter_of_a_rectangle_worksheet.pdfIn PDF document text
    • http://navalny.design/volando_sobre_el_pantano5g343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493549/normal_6032f2dc71298.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/piwokibowolavanoloro.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/44297490468.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/get_accident_report_online_nj.pdfIn PDF document text
    • http://menenig.rf.gd/braille_scale_modelling.pdfIn PDF document text
    • http://folivit.epizy.com/what_is_the_theme_of_omelas.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_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 5140 bytes
SHA-256: 5a676ec0ad442e8a3878ccb76aa0cff274eb4125c215d3be12ea975558a4c39b
font_01_sfnt_off000115ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 11620 bytes
SHA-256: 6b3f16b34fbfbed9ded479dc46fff88ce25ff8f403670efcf4b5b9cc6d7ad6e8
font_02_sfnt_off00013cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC9 4532 bytes
SHA-256: 8ed484569d78ea0bc3110e1ad9c92aa5ce966c66778e0852f1dc400721dfb54f