Malicious PDF — malware analysis report

Static analysis result for SHA-256 216d86a0e627c98d…

MALICIOUS

PDF

92.1 KB Created: 2021-04-14 04:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3f68f6b54f25171bc2ebc4702e494ad3 SHA-1: 21788bf5cca644a68ba5345c77fdda25c7574c0d SHA-256: 216d86a0e627c98d1277946db30c7711ee1069fbbd450a3772a50651670cc54a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, https://druttle.ru/strik?utm_term=the+way+we+live+now+movie, is likely part of this malicious infrastructure. No scripts were extracted, but the PDF structure itself is used to host these links.

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://druttle.ru/strik?utm_term=the+way+we+live+now+movie PDF link annotation
    • http://calipshatngaccs1.xyz/81792988270b5w5s.pdfIn PDF document text
    • https://xapodopuk.weebly.com/uploads/1/3/1/8/131856257/eca74eba5c87d8.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/LDaihgh/ready_maker_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/jchageJ/rumble_strips_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/hhAijAg/ancient_roman_empire_government.pdfIn PDF document text
    • http://aycotoro6.xyz/error_code_information9rmi2.pdfIn PDF document text
    • https://fimiwopagib.weebly.com/uploads/1/3/5/3/135315251/b5ce0de938bfbec.pdfIn PDF document text
    • http://moreprodukti.com/how_to_bend_a_45_degree_offsetzpb92.pdfIn PDF document text
    • https://toxofeleziwogiz.weebly.com/uploads/1/3/1/4/131406173/6784227.pdfIn PDF document text
    • http://trackengine.host/sasuremopageboriv90gwz.pdfIn PDF document text
    • http://gakujimogudap.22web.org/givida.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/11c62.pdfIn PDF document text
    • https://jitivafume.weebly.com/uploads/1/3/0/9/130969372/pijawexugubikif_fazimalebub.pdfIn PDF document text
    • https://xefinaloze.weebly.com/uploads/1/3/2/8/132814425/kejatufotitumakiguxe.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/721333.pdfIn PDF document text
    • https://notebatamigoxaw.weebly.com/uploads/1/3/4/7/134715817/3f7030a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://saretozegif.rf.gd/why_is_my_lawn_mower_engine_surging.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_86b205e188804944867cc1feb8bece28.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_1a997b58d6aa4d1d88840dbdb923042d.pdf?index=trueIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_cb27723a215d4db48b94af10b55785b0.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 10944 bytes
SHA-256: b7c9b1482cd9a0c53e937bce0468c42a6f176d0ebfac1afc354b85ab0b81dd80
font_01_sfnt_off00011f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 4564 bytes
SHA-256: c3f07ffcdc0fc276fd5f0e713a59354c491bbac7a7991b1f9befd335a8cae9e4
font_02_sfnt_off00012e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E71 11188 bytes
SHA-256: ee4738e857da81eb54b5de095cb49c8caf781fe7d4673e363b6279e32dcdd0ce
font_03_sfnt_off000154a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378