Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef02dceda086e19…

MALICIOUS

PDF

80.9 KB Created: 2021-05-23 08:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 89637ed7291fd6a1b9e4353baff5e2c0 SHA-1: bc99db16e4526f1ae1a25951e215ffb8890a272f SHA-256: 9ef02dceda086e19c9ff565b6be0d0f92cc619163b4acf759d770a0aca428d2a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified as a link farm. The primary purpose appears to be SEO manipulation or distributing malicious content through these numerous URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://vilenefex.ru/strik?utm_term=who+is+the+strongest+japanese+god PDF link annotation
    • https://pusavipesuxa.weebly.com/uploads/1/3/1/4/131406286/95a5986efc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380680/normal_6009085ff23df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483388/normal_603bd5495efd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_602f336d68e4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_6016f803ad2fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444366/normal_6006dfc03d1cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_60146a814009f.pdfIn PDF document text
    • https://fatatarulawug.weebly.com/uploads/1/3/4/4/134474158/mufizefuxeketowuvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385228/normal_5fe4cf4d4e0e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446382/normal_60565350d9680.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470400/normal_5fe00dcc7b92c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_5fe83cb4ad73d.pdfIn PDF document text
    • https://bepixumute.weebly.com/uploads/1/3/5/3/135302933/c2a1529.pdfIn PDF document text
    • https://jumufewaxijakuk.weebly.com/uploads/1/3/1/3/131380308/barumaduguxubosuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408464/normal_5ff25e0243cb2.pdfIn PDF document text
    • https://zugasunisozabij.weebly.com/uploads/1/3/4/7/134759734/desuxezirafob_vikejubep_pitirogof_nevitin.pdfIn PDF document text
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/5610258.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367305/normal_6009ac12af552.pdfIn PDF document text
    • https://zuzumapi.weebly.com/uploads/1/3/4/3/134344149/magew_loresamugedubur_bebogobo_badexuwov.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/03d35701-1467-4b95-b2d6-75cd757bb8dc/talexunoxot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b040daeb-e38a-4748-98d4-b486d1d58add/26719164640.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ded4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDED4 10200 bytes
SHA-256: 17027815487a92a3d049d23a3b57cfae6662a25f287aaeae7ffd7e28c4bf46e4
font_01_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 5280 bytes
SHA-256: 7ef44b480b8237bd9064a84d837b4a4732bc28be4e87e04ca5030ec237afcbcb
font_02_sfnt_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 10552 bytes
SHA-256: dd84cc280ca5e93dea8bc79eae3cad8f71376c508e0c97f52dadc76cfc026cb9