Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f143e77e62c6256…

MALICIOUS

PDF

81.5 KB Created: 2021-04-25 11:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1f42ca6f06f7e2bd9a23fe8d1b73d182 SHA-1: 282840c9cd7d2a12912fb7e5465093fa5c2856ae SHA-256: 8f143e77e62c6256e9afa080d966661e80188ce140fa9c2af7a0d9445cfbd2d1
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and at least one link redirects to known malicious infrastructure. This indicates a likely phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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 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.
  • 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://yafferge.ru/strik?utm_term=how+much+does+a+liftmaster+85503+cost In PDF document text
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/rilibuzeme.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/jidujamuketukaf_vapaxelutewe_wozuvej.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/zizinuwefetul.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/nakisukedijojuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/UjbpigA/31849299603.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/67327209094.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/hjeYjgz/the_walking_dead_2019_season_10.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/ibPnBhe/does_norman_dies_in_the_promised_neverland.pdfIn PDF document text
    • https://rirosivipoxutu.weebly.com/uploads/1/3/2/3/132302830/samile-lufixow-tokijobupu-medegedudu.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/broiler_farming_manual.pdfIn PDF document text
    • https://kizerovum.weebly.com/uploads/1/3/4/7/134747257/janudiposepupizo.pdfIn PDF document text
    • https://jimuvidagonolab.weebly.com/uploads/1/3/1/6/131636746/sejunazijaja.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/6gctHib/collage_maker_for_instagram.pdfIn PDF document text
    • https://besuxape.weebly.com/uploads/1/3/4/3/134374749/zuliveru.pdfIn PDF document text
    • https://bosonelete.weebly.com/uploads/1/3/0/8/130873804/nedebegis.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/mopavuru_kulatined_dopode_gubejuxubuwolaw.pdfIn PDF document text
    • https://vugigedekamem.weebly.com/uploads/1/3/4/3/134339685/xubirad_pobisafarasopo_kinujagul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kaxukok/73931542674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a243a02-08dd-40dd-9b1d-74d289d55bdb/how_to_cure_fire_ants_bites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f681abd-5b44-41f3-a7fe-50a98c32161f/audio_driver_windows_10_64_bit_lenovo.pdfIn PDF document text
    • http://ruronegiseko.atwebpages.com/kutesufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56600ed7-6672-416d-8e15-02975d2ac8f2/naxupewedizelejuwedediz.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/perimeter_worksheets_grade_4_free_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/dd_5e_way_of_the_four_elements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80262b10-b571-4eeb-94df-99e95c050b60/what_are_the_functions_of_oxygen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97758690-22c1-47a0-8894-cd5520c46bef/84784654.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 5940 bytes
SHA-256: 4454a4c5a7e7bea89b5a0baf0ee6b9cd056e730851ac3f117cc5859b62be5de0
font_01_sfnt_off00010e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 12076 bytes
SHA-256: be24db464d3d07c1fe18ace31a060db77d3404dca24da6b8bd70f2acae716c77