Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43252b60872ca0d…

MALICIOUS

PDF

80.8 KB Created: 2021-02-24 19:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cde1e1ab36eb494d839659b52d633298 SHA-1: 77a4c96e2a0317b9708ca8516198e020567ac2d3 SHA-256: c43252b60872ca0d294f83358be3629e2f12d240f3bb892aaba6570c199981b2
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 link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=sub+zero+refrigerator+642%252Ff In PDF document text
    • https://cdn.sqhk.co/pozigafo/Ajjvujd/matewan_movie_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_600b40d17c4f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377935/normal_5ffe8420b3c7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483589/normal_5fd896485a4c5.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/agjeif2/24385990461.pdfIn PDF document text
    • http://fapadobitazi.22web.org/gezozumeki.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/ieMGCSt/36025759633.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/hfBxzwN/dark_knight_trilogy_blu_ray.pdfIn PDF document text
    • http://saudiautoinsurance.com/veredarodedamivutetozoriv8npk0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403541/normal_5fcb01cd36e01.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/EhfDTH6/bazuditefekiwejumanavuze.pdfIn PDF document text
    • https://cdn.sqhk.co/bebubofawa/IrEegjk/22133516997.pdfIn PDF document text
    • http://proita.fun/rezedu76een.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496380/normal_601f9388f3847.pdfIn PDF document text
    • http://creditreportfast.info/wegekikemifuzabidajorazicrdqm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_6034050ede149.pdfIn PDF document text
    • http://jobware.pro/gold_stack_rings_australiapwnb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_5fd28b045ab4d.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/gjhhghB/us_civil_war_history_books.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/giEYRhd/siwiruzubekel.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
    • http://zarevamemamafo.rf.gd/wujuboz.pdfIn PDF document text
    • http://titetirif.epizy.com/96782505141.pdfIn PDF document text
    • http://subugemorikeg.rf.gd/borderlight_app_for_android.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 5204 bytes
SHA-256: 2e322ffdc441b1cc566d28c9f24024264980035e2c1f6c585365b1e44d8f663c
font_01_sfnt_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 10712 bytes
SHA-256: ec2db12a95348b5f51dd61c3d384abc68afdb9971d9394b9a038deeec11cdc5c
font_02_sfnt_off00010f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 17068 bytes
SHA-256: 56772e859ae4586a8ee75e6862afd9513734a2347815f400324476be4f7baffe
font_03_sfnt_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378