Malicious PDF — malware analysis report

Static analysis result for SHA-256 837b1c12859cf588…

MALICIOUS

PDF

72.9 KB Created: 2021-03-23 23:05:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7077e9efbaa1666dec89c74f4d6787ab SHA-1: eafcf309afb04a3a8f8ad17026186146374516a6 SHA-256: 837b1c12859cf5888b0914425dbcf5b6638ef1adab722bc57b5a9cfb5d5e42e9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://xezojetit.ru/123?utm_term=amtico+form+valley+oak
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5fde5fdfe74ef.pdf
    • https://pazerutafu.weebly.com/uploads/1/3/5/3/135392620/ca912547c.pdf
    • https://vuzowukuz.weebly.com/uploads/1/3/0/8/130814197/4131029.pdf
    • https://static.s123-cdn-static.com/uploads/4479932/normal_5fc7c52733777.pdf
    • https://jemiliwolozeli.weebly.com/uploads/1/3/4/8/134870182/kotilirelepenu_welob.pdf
    • https://cdn-cms.f-static.net/uploads/4378406/normal_600b35d07dfd3.pdf
    • https://cdn-cms.f-static.net/uploads/4412154/normal_604a15b6810ee.pdf
    • http://witaxiwudit.iblogger.org/definicion_de_anemia_ferropenica.pdf
    • https://nituxokijawagez.weebly.com/uploads/1/3/0/9/130969825/sozumubarewor.pdf
    • https://cdn-cms.f-static.net/uploads/4424328/normal_605524dfbd604.pdf
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/jowetopinenatefa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pazovugal/ratos_annual_report_2007.pdf
    • https://s3.amazonaws.com/kavalukato/45498100954.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/a_writers_reference_9th_edition_ebook.pdf
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_6ad5d635ba6048dba339dbd25e59d520.pdf?index=true
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_e0ddc26d4f8c42f0a786541cfe22691e.pdf?index=true
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_4099ac562d9d455a8273fff82a6d2c52.pdf?index=true
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_2c8ab284c61b47f69cfe8629d21a6624.pdf?index=true
    • http://naxokagad.epizy.com/upsc_cds_2_syllabus_2019.pdf
    • http://futezazunup.rf.gd/pro_tools_11_mac_crack_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27b.bin
de89346a0533564b0d2e63c2cd9ac17a96d1bf484e80e445a3b2d834d3dd46b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 5064 bytes
font_01_sfnt_off0000f3af.bin
3fb7a467e41fd7dd3a567892afa4e218f54109c5f9d49996599bfef39ac066d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 10216 bytes

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