Malicious PDF — malware analysis report

Static analysis result for SHA-256 e511387245e5e5a7…

MALICIOUS

PDF

68.4 KB Created: 2021-04-10 11:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7a1488e32d7ee0601cb2372ea7327da3 SHA-1: d7453f1d4589e80f682c0f28bcf1b1d85e7f8a3c SHA-256: e511387245e5e5a74227188c1223f8a473eb701ab6ecfbb9233e6aeb3d930a40
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=hayward+cl200+cap PDF link annotation
    • https://cdn.sqhk.co/kagawupatow/Ptjgjhh/jezivepesuvulefezoraja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_603b23ccd6074.pdfIn PDF document text
    • https://cdn.sqhk.co/raguwubives/hdjejaI/kopopevisu.pdfIn PDF document text
    • https://cdn.sqhk.co/jufijejebu/cHiajhw/all_saints_mens_jacket_size_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/gCgilji/how_to_open_hide_files_on_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_6021f856f2241.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/3980407.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/17Gjghi/37862477085.pdfIn PDF document text
    • https://serukerikexukut.weebly.com/uploads/1/3/4/8/134887074/6121693.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487631/normal_5fdcc16c78805.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/hbXMjbH/standoff_2_mod_menu_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445749/normal_5ff0dd2cbeb57.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/I7idqha/mibuwekuminiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3350d16e-2476-487b-844f-3942c02081ad.filesusr.com/ugd/25270e_760092a148cf4d128b8935b271ff0c18.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_edd95b57546f4113a50dfd7f4bc9753f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5f461b-3932-4936-8c1c-700656d45d57/67278103923.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_e71cba5ce8fa46e59db04e18eaaa392f.pdf?index=trueIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_cb3a2c4ed226481eaff5146ba64f9e67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae3e08e-71ed-4f77-9274-5f8838ab26f1/remington_16_electric_chainsaw_blade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95888b3a-9065-4905-b63a-69a80584fa9f/marvel_films_in_order_of_storyline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39934eb2-d34d-47c9-a709-d42b860ed544/sat_prep_black_book_mike_barrett.pdfIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_f1e2ea8cef6e4ab08f8f40400b7b4667.pdf?index=trueIn 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_off0000cf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF35 5320 bytes
SHA-256: 35dac4802e5b671461092a036b2c58eed6f38f9ae986a76c5168034541bd02a0
font_01_sfnt_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 10224 bytes
SHA-256: 9e7789e7a32b369658f06e1d7ef21b857e9acf2b375b24e02ef903e01909750e