Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c49de152f80f9dc…

MALICIOUS

PDF

76.7 KB Created: 2021-04-24 21:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 32eb17f9ac0eea92dc05716aa7a5a0f6 SHA-1: e8052c6462485b9f7e679639312d94f8acedae73 SHA-256: 8c49de152f80f9dc3d6fd5fcff9bc6e2df85622da769b378169a25a9721d4ada
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, and one specific URL that appears to be a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

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=how+to+use+a+singer+machine PDF link annotation
    • https://cdn.sqhk.co/notenirikev/kJDhjQu/27005734969.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/Xjfhetb/tegajasosofemajopuvaje.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/gfpie9z/beriwilopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_9c724441db7f48cdab229d0b91537aa7.pdf?index=trueIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_b43c9eb202524dc7aeaca490f901eb3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c0a1f7b-6b4a-4abe-bba9-7995410d60a0/81159662962.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_c2b9b0459449477d9a56d90e028bd238.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_040d6906385c410d94c77c52de1c3d50.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b666a5-9424-4401-a96b-1d477f9a9b37/44664809603.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/kixisazexetudinijotifar.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_1676fe98ec674cf4a82b5bb91cb8fc5d.pdf?index=trueIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_a24a66dcad69494c89b49267267fa8c9.pdf?index=trueIn PDF document text
    • http://suwuriru.onlinewebshop.net/bratstvo_crnog_bodea_18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef66c4e3-5cdf-4d9b-9287-bb5a34ebb67a/honeywell_programmable_thermostat_rth2300b_wiring.pdfIn PDF document text
    • https://ecad98c5-3f79-4b5a-9309-7060426a101e.filesusr.com/ugd/66ec94_3b3d5a24d2144449bc367ab9912519b9.pdf?index=trueIn PDF document text
    • http://rakorexifaxokur.rf.gd/loxuguzubovidudufas.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_5243103b23984ef99563cb31d8f69713.pdf?index=trueIn PDF document text
    • http://xigivemarigefa.rf.gd/aoac_standard_methods.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_429d60bff183414682f98a4356e2daa7.pdf?index=trueIn PDF document text
    • http://nununad.myartsonline.com/tapikolafinamejobaritosa.pdfIn PDF document text
    • http://vosikixu.rf.gd/mowetur.pdfIn PDF document text
    • http://pamubaj.epizy.com/obtencion_de_capsaicina.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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 5236 bytes
SHA-256: 22e4bc0b68863e6a691340280facd8da6c48fbeb6b7b2e8b999274063fc7ffcc
font_01_sfnt_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 11364 bytes
SHA-256: 523fa7be54119c1f5c70a1bb364c4a49f82840321eb73a17956d686a665d931c