Malicious PDF — malware analysis report

Static analysis result for SHA-256 561bf06cfa05db0d…

MALICIOUS

PDF

86.2 KB Created: 2021-03-23 18:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d674b5a77a541a957d016a1159907229 SHA-1: 9611f89f85f567935a4ae48c9a681baa36bae03e SHA-256: 561bf06cfa05db0d396a578464155079fd3c6916070373a0cd1d2f03b4b00750
186 Risk Score

Malware Insights

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

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 0.9996

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://bologen.ru/strik?utm_term=how+to+clean+breville+barista+express+espresso+machine PDF link annotation
    • http://xuvivok.22web.org/78446137103.pdfIn PDF document text
    • https://vekukedabil.weebly.com/uploads/1/3/4/7/134710008/zosoperakojixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_60435cdcc913c.pdfIn PDF document text
    • http://pasanubilop.iblogger.org/chasing_the_dragon_2_full_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_600a4fe16baa4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445130/normal_5fc8cff881726.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410443/normal_6004f3ebbdfa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_60258af970031.pdfIn PDF document text
    • http://sudebatuwilazet.iblogger.org/betikivivomepiguk.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/rogaxomevuditop-kiresig-ruruf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460072/normal_5feb2be1b5cf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406777/normal_5ff880628ca6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_b916ecaf87ee4ac3b63d01413012f89b.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_bc814f048af94a2f851236b94b0907a6.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_2b74038f75084d09aec5285e717049c4.pdf?index=trueIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_d4511ab414e24b349c88a320aaa697d0.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_ee596d7da9a644579c8c4cd6ed1d406d.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_9eb6fb125f714e92a79da71d97031620.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_6eb0234dd9c9432a92be0de36596503a.pdf?index=trueIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_0de40ae5dfc74aed910a42f6b37f1530.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_40d22589d114465fb060de4e4b5d33e9.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 5496 bytes
SHA-256: 6fad32cd94653d8c55a355c2a7052fa67513a0d23cf56c4d2c96d47758a8d397
font_01_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 10984 bytes
SHA-256: 33c83ae45bf9021a073bacd881606c3b56eb0cc33528d1f190386b5939342161
font_02_sfnt_off0001339e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339E 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7