Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cb17a7f0408a63…

MALICIOUS

PDF

73.7 KB Created: 2021-01-10 01:08:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 88b7e76c8009204226bed69842eb82da SHA-1: 64f76d36461aeb5e5c5f16e6152dbd32c0f24743 SHA-256: 90cb17a7f0408a6382b399bf312e0cceb54ae360498b98e14b123a41908c246b
134 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external sites, with one specific URL pointing to a "dvdvideosoft free studio crack" download. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or trojan distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/aws?utm_term=dvdvideosoft+free+studio+crack PDF link annotation
    • https://cdn.sqhk.co/supesuvepo/hMhayjc/20523834159.pdfIn PDF document text
    • https://site-1176340.mozfiles.com/files/1176340/motorola_razr_5g_verizon.pdfIn PDF document text
    • https://site-1174531.mozfiles.com/files/1174531/lego_hidden_side_fire_truck_target.pdfIn PDF document text
    • https://site-1228990.mozfiles.com/files/1228990/quotation_template_for_web_development.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/zabawazex-nupasarixawif.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/cGBihzg/incivility_in_the_workplace_healthcare.pdfIn PDF document text
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/301550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_5fe63cf7219ac.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/sivedopagiziru.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/iehjwge/sonic_dash_2_sonic_boom_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421049/normal_5f9a42422ed19.pdfIn PDF document text
    • https://fewurigog.weebly.com/uploads/1/3/0/9/130969621/kofezobuzomu-zexobojolowad-wubov.pdfIn PDF document text
    • https://site-1171656.mozfiles.com/files/1171656/88466279206.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/ggBhahf/76376726896.pdfIn PDF document text
    • https://site-1234698.mozfiles.com/files/1234698/36274520351.pdfIn PDF document text
    • https://vevejeda.weebly.com/uploads/1/3/0/7/130776099/pinawe-jumemukibiw-takatin.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/genedonapubefe/beganebebajutokigotimum.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_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 5108 bytes
SHA-256: bc7457ad7869278f05d94ff0fdf735b9d70aa573035b1db0862471d3774c84af
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 10664 bytes
SHA-256: a0c5ec55244dd1945ec4333aa36eeb80c4826c7cf2e0b703831d038ab29a04f6

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