Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de75efd542780fa…

MALICIOUS

PDF

73.3 KB Created: 2021-03-20 07:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c705af981f68338fecabea76bce15ae1 SHA-1: 1f67e4e1f73714c128e4ff1529a98f3164693dcd SHA-256: 1de75efd542780fadca4bae3bb4d55949238dc0e14aa047e3dfb863df031beb3
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs, such as 'https://leonvi.ru/strik?utm_term=ncaa+division+2+football+scholarships', are likely used to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/strik?utm_term=ncaa+division+2+football+scholarships PDF link annotation
    • http://tejowigasinafu.getenjoyment.net/game_of_life_conway_patterns.pdfIn PDF document text
    • http://nitafibejuze.mygamesonline.org/71687745521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_601855dcd3e08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_602e734bb8d92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488314/normal_602f330526a24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_1b0444dfe37041399afa3cf9e6877bf2.pdf?index=trueIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_b067f7a07dd44d97894905b5edf98833.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_64e4c34041e54a7e9ca702c814c0b5b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/67500572116.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_b64402eb04b1490f8332c165b7b5e37d.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_4d69b99885b7429a95d3d2d60b214d79.pdf?index=trueIn PDF document text
    • http://varirojemixu.myartsonline.com/gear_tooth_vernier_caliper.pdfIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_8b78e95f7e134dfbae6aa38e77572cdb.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_288f6ed0a34d41feba8f2c03357aafe7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lofese/attitude_status_video_mirchi.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/37634939994.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_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 5544 bytes
SHA-256: daa5cbfb658d21fc466a6f2b7859aaf85923d8d0d6c68811a99978ca482a5dbe
font_01_sfnt_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 10264 bytes
SHA-256: 28a3d71b0dadda55ae14ca9e2ee8f94f60416ebcb6ba3e353bafb75e016e8d91

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