Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fafebd4aedb84bb…

MALICIOUS

PDF

73.0 KB Created: 2021-04-07 04:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 28302a4fab08cc0cb1ac16505996ebba SHA-1: 9d6b53c25cb108976743919e2c2869660ffcc0be SHA-256: 5fafebd4aedb84bb812ddfa996b0d99e258219315eaf715d9fc7617258af1039
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely attempting to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/wix?keyword=wacom+intuos+cth+480+pen+nibs PDF link annotation
    • https://cdn.sqhk.co/tezejikibus/geic2ij/73723808024.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/djhBuja/converts_radiant_energy_to_chemical_energy.pdfIn PDF document text
    • http://fiziwafofekaku.mygamesonline.org/24795706916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_6017190e60e06.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/51290399004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500200/normal_606cd6e43759c.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/wijazozosobofedel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527859/normal_5fdd2e8633821.pdfIn PDF document text
    • https://cdn.sqhk.co/zujijivopuju/pwhimhX/sound_equalizer_for_pc_windows_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482629/normal_5ffb6d77d3ea2.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/3bhfHgh/rtc_las_vegas_nv_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/jhjeigc/maze_runner_book_2_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/velovezem/cjcjbjg/kumuzovirizutixofulap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477658/normal_6001dedd58eaa.pdfIn PDF document text
    • https://cdn.sqhk.co/zoturisa/hhihHp7/sukarasiwogakeropu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://penanaras.myartsonline.com/95084775949.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/20824817467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f563981a-92bd-4b86-8500-19c305a24347/ravpower_filehub_plus_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e325d108-e9f4-48a8-96b7-582125ca4afd/ripopuzewavitajefexapeg.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/52642138054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1f1f09-b314-485d-8dc2-964dc36951a8/konirunenuliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dbe7736-d753-42e7-8723-d2b79abfe3d2/is_there_a_percy_jackson_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a6d57c-11f8-4e6e-a656-fbb00bcc78dd/42940352744.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_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 5624 bytes
SHA-256: bdf7112b1ef1721b82da0aac4040eefbc2242def9885228ed6a652882403e4a5
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10592 bytes
SHA-256: 9d0253d2482cdb897d492b4383361b327eaf186a588d5aa3455aeeb0a9c7aaee

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