Malicious PDF — malware analysis report

Static analysis result for SHA-256 baca756be0604109…

MALICIOUS

PDF

75.7 KB Created: 2021-03-21 03:11:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 93b645a1c9202214a79c7ae92aaa619d SHA-1: 9055b1eb0895696bfaae6829e432a46d6cbc545a SHA-256: baca756be060410988b9e3ba3a922fe20625ed88eae8928293d58173493cb644
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/strik?utm_term=how+to+program+lg+sound+bar+to+spectrum+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5fd22a85208c4.pdfIn PDF document text
    • https://kesowetowewi.weebly.com/uploads/1/3/4/5/134598476/3716411.pdfIn PDF document text
    • https://zafudibibini.weebly.com/uploads/1/3/4/1/134108698/d9f4ce2cf.pdfIn PDF document text
    • https://kamobukumigudeg.weebly.com/uploads/1/3/1/0/131069934/sezopoxijajarelowiz.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/bakunuxaledid.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/1ef87b56cded85.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/gosetobusak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_603ec49def7a3.pdfIn PDF document text
    • http://ig-supportcenter.xyz/true_love_dating_chat_flirt_and_meetingkdmx8.pdfIn PDF document text
    • http://pe50off.info/zariburogapaseru7kg63.pdfIn PDF document text
    • https://kazarebowuw.weebly.com/uploads/1/3/5/9/135972211/merimokip.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/a3c6f8b7-edfd-4cbe-a9fa-4edfabe4e8c9/sofudamepozerozuselaruf.pdfIn PDF document text
    • http://lutubipejor.rf.gd/chahal_kaaf.pdfIn PDF document text
    • http://xifabemifuxiza.rf.gd/99853130733.pdfIn PDF document text
    • http://mezureda.rf.gd/38980298300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade28769-39ae-4a97-96b6-d99a3a4b978d/gifosifugojutizew.pdfIn PDF document text
    • http://legujajojozete.epizy.com/dogozapulifomulilu.pdfIn PDF document text
    • http://bazodumijot.rf.gd/psd_book_mockups_free.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_off0000e928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 5584 bytes
SHA-256: 9a51dc8e4f28d4a0853872118131053a255730ee73b998868cf95a9a128b2f8e
font_01_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 10984 bytes
SHA-256: dd4cc9d246996f89d24410fd0e9a0a961fa8a77a08f102a9d0b657dcc7a2c74c