Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c291d24fc0c201…

MALICIOUS

PDF

89.3 KB Created: 2021-03-15 12:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 294ce663713289c0fed04bd8028b6e5c SHA-1: 9d187cf8cd9d384b3593a5daccff0bcb5042b06a SHA-256: 82c291d24fc0c20168f9b7f2e6f5891a0bcff387d31d14638ea30d23f1772fe7
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://dafemum.ru/wix?keyword=estrategias+de+mercadotecnia+pdf PDF link annotation
    • http://jujasoje.iblogger.org/is_55_inch_4k_tv_worth_it.pdfIn PDF document text
    • https://kukurako.weebly.com/uploads/1/3/5/3/135321284/rugurojedonomefi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367278/normal_5ff56af0c9d4f.pdfIn PDF document text
    • https://vizefibamoraxob.weebly.com/uploads/1/3/4/6/134613498/9764060.pdfIn PDF document text
    • http://lamanixumerad.mypressonline.com/29272581768.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/whats_the_most_dangerous_city_in_new_york.pdfIn PDF document text
    • https://wavamabixalovag.weebly.com/uploads/1/3/4/5/134525364/f08da3560.pdfIn PDF document text
    • http://wokizunapajunez.iblogger.org/yaadon_ki_baaraat_movie_song.pdfIn PDF document text
    • https://bukalejobiwasek.weebly.com/uploads/1/3/1/4/131409200/sifiripasot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368228/normal_5fe45e473f44f.pdfIn PDF document text
    • https://majivuwuwu.weebly.com/uploads/1/3/2/6/132683475/52576b924.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/canada_steel_exports_to_us.pdfIn PDF document text
    • http://dukofinezamidol.22web.org/elementary_surveying_15th_edition_solution_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3be360-c4be-48df-b6c3-82781a43f87a/xibomegisaxewiwo.pdfIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_620036244702423782a5a0513455d083.pdf?index=trueIn PDF document text
    • http://tuwutexo.onlinewebshop.net/websters_third_new_international_dictionary_unabridged_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ae1e2b-9535-4b36-af6a-0c75be5732e6/sennheiser_ew100_g2_disassembly.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_2fbee6cf901c4a84b81e8102f320c450.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05004cc8-12f8-49ad-8d85-fc7872f55f92/what_is_the_devils_numbers.pdfIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_8e7083fa4f774694b82e1d21693d3eb4.pdf?index=trueIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/9_fujifilm_xp80_finepix_digital_camera.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 5400 bytes
SHA-256: 97fd812bce15b087be466417ed80be21119e1890b3e79b30f2b9261bb7208eae
font_01_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 11740 bytes
SHA-256: faa44afcc9734ea3b77e2dc4279f78613e336de22f9618443c7476e39e94d446
font_02_sfnt_off00014039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14039 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1