Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb97619e6cad19a0…

MALICIOUS

PDF

75.3 KB Created: 2021-04-03 23:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cb534f610a1cec0d43b2b39ef4827fce SHA-1: ebf1a8a1d8a16dae15f072efd92639bd9356d76e SHA-256: cb97619e6cad19a003ad11cbf4125664d782e15aa2ddc82b3fdb68cf77ba2f14
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The primary URL, https://baarspo.ru/strik, is likely part of this distribution chain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=statistics+for+business+decision+making+and+analysis+2nd+edition PDF link annotation
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/kabiduxubesaf_zozamuxufomej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443371/normal_603bd548dba16.pdfIn PDF document text
    • https://jibidamo.weebly.com/uploads/1/3/5/3/135337573/5025862.pdfIn PDF document text
    • https://xadafujivesa.weebly.com/uploads/1/3/1/3/131397927/xuduzoje.pdfIn PDF document text
    • https://tudimase.weebly.com/uploads/1/3/5/9/135985307/2164427.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/5960957.pdfIn PDF document text
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/birapavufaputiduji.pdfIn PDF document text
    • https://duxujemiw.weebly.com/uploads/1/3/4/7/134743688/kipanisijalit.pdfIn PDF document text
    • https://bokesaxigalul.weebly.com/uploads/1/3/0/7/130776824/relif-wifimobovaledag.pdfIn PDF document text
    • https://xusumenebob.weebly.com/uploads/1/3/4/4/134478057/duxevetigosa_nugojodugivobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_6064ab0839a92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_4280d8786e1e466baec04752074c2e0f.pdf?index=trueIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_9018d86f5ee04314b6e791084ac72af8.pdf?index=trueIn PDF document text
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_f2d25a4be25d4e899079842f2c5a1788.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tamovagag/inservice_sign_off_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1230fc-5fc0-4db4-90bf-36b94692b987/how_to_use_a_vitamix_as_a_juicer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be62c2b-2e75-4362-8a04-610a03a68702/5_poemas_en_lengua_indigena_y_espaol_cortos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0dbc87b-61ee-4ff9-8726-bca9a77ac32d/52187097788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc2fbbd-d9f0-48cd-bcdc-2ca250675c07/19792445980.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/31409797813.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_7434bc36eac3489d9d895b45b7646c9c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 5880 bytes
SHA-256: 0770ef4190803994ce7441bef0824c5217f6d50199e32c62e1f2583d11a1fa07
font_01_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 11056 bytes
SHA-256: 270f09e65ab67bfddbe1ac29466618a583b4ff423b4097fb90f846b95b6d78d0