Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c71b3e983e2902…

MALICIOUS

PDF

77.1 KB Created: 2021-03-13 20:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 413d417f5e0589fe851853d464a73fcb SHA-1: ae6b1268abe815b47c718689f5ace1ddcc4d03e2 SHA-256: 10c71b3e983e290218819439fc7952eade556ef0ddcc8f879929782b8e46f231
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 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.
  • 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://dugedepap.ru/123?utm_term=afrikaans+dictionary++shareware PDF link annotation
    • https://cdn.sqhk.co/selusujava/dshdxDg/amazon_truck_driving_job.pdfIn PDF document text
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/3394957.pdfIn PDF document text
    • https://bokefelefu.weebly.com/uploads/1/3/1/3/131383825/1a3f786.pdfIn PDF document text
    • http://saxosoxajivovud.medianewsonline.com/89386462295.pdfIn PDF document text
    • https://tafiweva.weebly.com/uploads/1/3/5/9/135993394/pevozadunag_nopedun_xopukegolu.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/hft7DIP/zixidokuzupepalepi.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/in1kHWk/60696488332.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/fihiiih/dvd_movie_editor_software_free_download.pdfIn PDF document text
    • https://kamojadatuxam.weebly.com/uploads/1/3/5/3/135316538/liridefutebi_vevup.pdfIn PDF document text
    • https://cdn.sqhk.co/baxikomo/c2ieXgh/48052737643.pdfIn PDF document text
    • https://cdn.sqhk.co/kofatuziwu/jgdiel5/paradise_island_tv_show_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/6YgjZBv/roiworld_fashion_dress_up_games.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/bikikanafopavu/autonomic_nervous_system_mcqs_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/28370785970.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/maze_runner_2.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/23266698863.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/95512980905.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/artificial_neural_network_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/agnyaathavaasi_movie_hd_720p_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/47703909576.pdfIn PDF document text
    • http://giworutiw.myartsonline.com/70863244844.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/kenneth_hagin_books_on_healing.pdfIn PDF document text
    • http://furunes.onlinewebshop.net/gunaxejoferusovawugiw.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_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 5324 bytes
SHA-256: 54d944ec7b9c2d6f9d666b803327c84d6f0c3019dadbd9868fc45c3595137826
font_01_sfnt_off00010189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 11176 bytes
SHA-256: d19b167503d47f0c12501753733965fc5f643f42724407cbd310f0c1243f7c2d