Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a6c9e7af8e791c…

MALICIOUS

PDF

77.4 KB Created: 2021-03-21 21:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1a105c0fb12da3131bafb0bea2af9e9e SHA-1: cd629638dbb30224262eb3e288fa2dc669752ce1 SHA-256: 93a6c9e7af8e791c34fe2a0805de1519f83f4be51f9adf7261e0235d0d8b4f46
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://leonvi.ru/123?utm_term=banana+nut+bread+nutritional+information PDF link annotation
    • http://trenolgia.buzz/street_fighter_2_pc_windows_104gwms.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5fdff668e8613.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/jjbdEha/connect_the_dots_with_4_lines_answer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_603a5a415d53a.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/81428467062.pdfIn PDF document text
    • http://wordwild-store.com/magnetism_worksheet_answer_keyga5vm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5fcefa74710e2.pdfIn PDF document text
    • https://cdn.sqhk.co/rumoligodo/Vyjjjgj/cricket_colony_setup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_601edb9534717.pdfIn PDF document text
    • http://lorubuxetorifa.medianewsonline.com/binary_from_database_to_file.pdfIn PDF document text
    • http://raisinshub.club/7888789745q2srr.pdfIn PDF document text
    • http://narovomesizi.medianewsonline.com/what_to_do_if_roomba_wont_charge.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/hgi9JDi/pamopidivu.pdfIn PDF document text
    • http://espacecmb.xyz/supernatural_cast_season_18sqs1.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/zjiiaql/pulitokosaw.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://s3.amazonaws.com/jebupofedijakuk/ravajezesetamuburilunif.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/35882617874.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/how_to_forward_calls_mitel_5330.pdfIn PDF document text
    • http://molodetagako.epizy.com/78835817789.pdfIn PDF document text
    • http://bitines.myartsonline.com/41258240083.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_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 4948 bytes
SHA-256: d55b3ca8084bcbad24bc72b053544805a71d958c8d31a38358a7135f0ada6b8d
font_01_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 10520 bytes
SHA-256: e808d36d72a87f737f783624de2d7bd1650179a71a21250821b1a4bca09c4218
font_02_sfnt_off000119c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176