Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b492a2699e24ae…

MALICIOUS

PDF

100.3 KB Created: 2020-12-13 20:54:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c4613c53a25770ea4fb3d7de86da889d SHA-1: dac8aa4d8c28b8bf1b6674a12a7e5d4523c545b3 SHA-256: 36b492a2699e24ae6a843c215231388983bddccbf85053de0e2e4b8476f47df3
244 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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=clay+county+ky+pva In PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/1129793.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/resavipibidote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465701/normal_5fbcf3cac7e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417423/normal_5fc1c1b623a1b.pdfIn PDF document text
    • https://gibuzilo.weebly.com/uploads/1/3/4/6/134602166/4161155.pdfIn PDF document text
    • https://vadazexo.weebly.com/uploads/1/3/4/6/134646317/9400339.pdfIn PDF document text
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/vexifibibufume_boxituzadore_valotuvibono_bomepexovalaba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371812/normal_5fcebd310367c.pdfIn PDF document text
    • https://zajuzazoni.weebly.com/uploads/1/3/4/8/134891144/02a60.pdfIn PDF document text
    • https://pituzidadago.weebly.com/uploads/1/3/4/7/134722752/tonugex.pdfIn PDF document text
    • https://pujatimosu.weebly.com/uploads/1/3/2/6/132681823/7bcee206072a88a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c66309a4-0738-499d-92df-19415464ed86/ejercicios_de_algebra_para_resolver.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/insurgent_full_movie_online_free_no.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/italy_travel_guide_10_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce7d89d-550c-490d-9fc7-543fdbc49ec9/audio_technica_at2020_microphone_stand.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014a2a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14A2A 25712 bytes
SHA-256: 58fa7c223987b40ff346ad9b746dee4466ded40dd7ef39815b64a0c27d4aab6d
font_00_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 4620 bytes
SHA-256: c6d83c4f70f28b0e53e5b6c0c68de9b9d91824e5a1dc518116792bfc27d943b7
font_01_sfnt_off000124bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BB 10948 bytes
SHA-256: 23bfa583f1dc2e3d9c598bf40f546bbcef3dc75c35fef16f48d9266cf1d4646c
font_03_sfnt_off000175e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175E4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34