Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9cc13380d28cae…

MALICIOUS

PDF

77.2 KB Created: 2021-03-15 13:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62cb839c31057066141cd5134ba96773 SHA-1: 78ee441afd4d404d534271e4f98332708f6cd72c SHA-256: 6b9cc13380d28cae29bbbfab54933675beda85728dee0794314c5bfa2f8c0fc5
156 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to PDF files, indicating a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=birthday+dinner+invitation+wording+template
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5ff3a04399a64.pdf
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/7824871.pdf
    • https://cdn-cms.f-static.net/uploads/4499972/normal_6039e7f17df8b.pdf
    • https://cdn-cms.f-static.net/uploads/4452865/normal_604e841e5258a.pdf
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/xapoxuterokev.pdf
    • https://cdn-cms.f-static.net/uploads/4449184/normal_6045f6de808d1.pdf
    • https://cdn-cms.f-static.net/uploads/4496592/normal_6022e7a1f3c67.pdf
    • https://static.s123-cdn-static.com/uploads/4412902/normal_5ff3c14c5862d.pdf
    • https://vinetiwufo.weebly.com/uploads/1/3/5/3/135305890/c2881f30.pdf
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/4388775.pdf
    • https://cdn-cms.f-static.net/uploads/4469350/normal_60158c176227c.pdf
    • https://static.s123-cdn-static.com/uploads/4452389/normal_5fc7995557039.pdf
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/sowewirufode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_076a3c514d29438e852336dc924aa1fa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8a0dc6ef-78bf-421b-860c-dc0b5f1478e0/the_crab_shack_menu.pdf
    • http://parepakikil.epizy.com/tojisofuluzikafabuz.pdf
    • http://dosekidonara.epizy.com/atem_software_control_download_mac_free.pdf
    • https://uploads.strikinglycdn.com/files/27949100-2e1f-404a-b6b4-7a7689b855d9/how_do_i_connect_my_canon_mg6320_printer_to_wifi.pdf
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_c52f592bada547cbaba83491888e50cc.pdf?index=true
    • http://kenodaguxofi.rf.gd/lenewe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea6.bin
385e994edec5eee63afb69053e09f51cd7b73520bced89cb55ca6f42b2754a58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 5496 bytes
font_01_sfnt_off0001014b.bin
b24a7f92f2fb8bfcffab6678115ca4faacb8c7a573f99ec75533bfeb96a3d570		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 11288 bytes

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