Malicious PDF — malware analysis report

Static analysis result for SHA-256 680a74b96884a209…

MALICIOUS

PDF

75.9 KB Created: 2021-05-31 01:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5a4b1108d53b397aba777d27f834c104 SHA-1: d9d537ed104bf670fbf182e6b53529ab997d23fd SHA-256: 680a74b96884a2097aac78071ab73f6bb27b258cd8e6d5ea2c52a9be5f35195e
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://golowaki.ru/strik?utm_term=bts+v+hd+images PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478946/normal_6008603d6e055.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384028/normal_600843046325f.pdfIn PDF document text
    • https://wekexobesunolo.weebly.com/uploads/1/3/0/7/130739288/rojudusa_keziwakiv_lugotub_tizomunedesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_6009b24b69174.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/gapetamikabaxe.pdfIn PDF document text
    • https://jobovivubip.weebly.com/uploads/1/3/5/3/135392816/9e407.pdfIn PDF document text
    • https://duvefotod.weebly.com/uploads/1/3/1/3/131380754/pubokemol-bexapap.pdfIn PDF document text
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/9729217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374708/normal_5fe1f517b6f31.pdfIn PDF document text
    • https://kafowuvipuv.weebly.com/uploads/1/3/4/3/134337110/4541088.pdfIn PDF document text
    • https://xezazevexu.weebly.com/uploads/1/3/5/9/135990031/0788a7.pdfIn PDF document text
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/rodelifupovo.pdfIn PDF document text
    • https://labimatejodo.weebly.com/uploads/1/3/2/3/132302966/likogutimagib.pdfIn PDF document text
    • https://wenozujilemufo.weebly.com/uploads/1/3/4/4/134456287/rimive-fetejejodoga-fividiwevedexom-popubirizudiwan.pdfIn PDF document text
    • https://ronizozobofer.weebly.com/uploads/1/3/4/6/134654069/kotopig-povozaturawinu-xakigurobudavep.pdfIn PDF document text
    • https://magudutetu.weebly.com/uploads/1/3/1/4/131437318/984968.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/netoxizen_mekomaki.pdfIn PDF document text
    • https://kebakikuvoti.weebly.com/uploads/1/3/7/5/137513313/3542668.pdfIn PDF document text
    • https://romudakon.weebly.com/uploads/1/3/5/3/135318284/monofimiselal.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/fa1d4ce0-6496-4550-a10c-2630a0ab0c64/how_do_you_find_the_angles_of_a_right_trapezoid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a920475-4356-4342-8d21-9b46ad9a923e/flip_professional_4.4.2.1_full__serial_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3195d6b0-db1a-4658-b758-d1e959c762e6/26416839496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0574ede9-e0ab-4c20-abc3-b2f5cc4e2981/vemulixezid.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_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 5220 bytes
SHA-256: 1dfc18f0f2a99085a7d750a95d52384aabf7d9830d44784b07c5ace21c0e8c95
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 10236 bytes
SHA-256: 6319f260150dca447ea0859f27ebf988e65b27853375537ee7dcc8e41b971277