Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee64c02fe4c28379…

MALICIOUS

PDF

78.2 KB Created: 2021-03-28 04:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b04ebd27ae6119ac9964a28e38fd5900 SHA-1: 8e511a6e54030cc94159c24b746143d696f2473b SHA-256: ee64c02fe4c28379c8a654820541af34d40299921db202689d1bd07e630b735f
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=what+are+some+funny+stories PDF link annotation
    • http://tavegumata.sportsontheweb.net/sir_arthur_conan_doyle_books.pdfIn PDF document text
    • https://cdn.sqhk.co/salijuvam/eeiPEtv/42245352125.pdfIn PDF document text
    • https://wawogikaso.weebly.com/uploads/1/3/4/7/134726687/bomug.pdfIn PDF document text
    • https://cdn.sqhk.co/gagupibi/Yic0TG9/57062612124.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/what_is_the_size_of_graco_pack_and_play_mattress.pdfIn PDF document text
    • https://cdn.sqhk.co/xukerejolar/aihjagh/international_days_list_october_2020.pdfIn PDF document text
    • https://tajamopem.weebly.com/uploads/1/3/4/7/134745730/27addecbed.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/jjegcgg/65045634310.pdfIn PDF document text
    • https://fobinoxibenor.weebly.com/uploads/1/3/1/4/131437242/majuwiwowuniputu.pdfIn PDF document text
    • https://bupagaxeni.weebly.com/uploads/1/3/4/7/134706040/5589126.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/ggidC8I/58354778607.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/formal_channels_of_communication.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/9909448038.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/fggdhhV/milafuzuv.pdfIn PDF document text
    • http://dutarotanazosuv.medianewsonline.com/85287133689.pdfIn PDF document text
    • https://cdn.sqhk.co/zitedefew/hdufHjb/tojosolonabigewemirakuri.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/dulif_vodunomozuva_nugixapug_pumesudij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_28c2de8949cb41e8ada20f847a7dadf1.pdf?index=trueIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_47c792f88c60442fa10b48d7483c136e.pdf?index=trueIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_785ae234844a4bb194a0f74c5e7f6539.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_50689e66a9f646a2ad9f559351b9f734.pdf?index=trueIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_d39a64a653c34eafaf410c928d2b888a.pdf?index=trueIn PDF document text
    • http://nofolimuri.myartsonline.com/12627818813.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_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 5088 bytes
SHA-256: b2f30afe2f5178ff8b1c45da8dd1395814e144e1d3a1d574c52eab3d0307fbec
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 11740 bytes
SHA-256: dbb79f44b903bf900f2c30d9d7af959a4c39aeb00ee4aa6922d823cbe02623f2