Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecce46fa98a0dc6…

MALICIOUS

PDF

80.2 KB Created: 2021-03-22 15:32:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecdf9204711528362dbe582052a377eb SHA-1: 238d293d3371b9a816eeaa4dd20d9cd4949fbb0b SHA-256: 8ecce46fa98a0dc67eb497065289994a9633879d347e898fa5f8c33b7a9c3f19
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or use numeric slugs, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=vitamix+a3500+sale
    • https://cdn.sqhk.co/gadukupuwe/VSoEaHZ/87479444876.pdf
    • http://koolmaxt.online/kinetic_and_potential_energy_graph_worksheet_answerspgm20.pdf
    • https://cdn-cms.f-static.net/uploads/4377120/normal_60140a4447863.pdf
    • https://cdn-cms.f-static.net/uploads/4373755/normal_600f4a5611054.pdf
    • http://strapslap.online/how_long_should_a_roomba_980_battery_lastfkaos.pdf
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/7100380.pdf
    • https://cdn-cms.f-static.net/uploads/4374839/normal_602af5f0c2ed4.pdf
    • https://cdn-cms.f-static.net/uploads/4496170/normal_6015da0defb69.pdf
    • https://cdn-cms.f-static.net/uploads/4498971/normal_601d8518402cf.pdf
    • https://cdn-cms.f-static.net/uploads/4467593/normal_6026075240336.pdf
    • https://turarizamagux.weebly.com/uploads/1/3/1/4/131453837/2dfc2d69.pdf
    • https://cdn-cms.f-static.net/uploads/4449012/normal_604f414480fdf.pdf
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/7477289.pdf
    • https://cdn.sqhk.co/tomubozes/hjhdihw/82375366226.pdf
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/gapojoki-rujilizifoge-mosudapubaj-xegis.pdf
    • http://ingmijn.com/english_synonyms_and_antonyms_dictionaryz1g87.pdf
    • https://static.s123-cdn-static.com/uploads/4488558/normal_5ff9108272f0d.pdf
    • https://pexekakuxop.weebly.com/uploads/1/3/2/8/132814074/d54801056b44f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mozedijiz/bacteriuria_asintomatica_en_gestantes.pdf
    • https://s3.amazonaws.com/diwitapezu/roster_form_meaning_in_kannada.pdf
    • https://s3.amazonaws.com/wizomoravazub/65235403965.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5e.bin
362fa6d2924dc5e0f9f4b4f40b91ba6ecf9348d130409c71f2902b073f5ca548		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 5200 bytes
font_01_sfnt_off0000fcfb.bin
7a43b337113349eaea9acc8b8f652697e813134f4fea06f83d63dc48f5033a5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 2916 bytes
font_02_sfnt_off0001094c.bin
f68584bae9010020b5ab298f9ca56638dd744d4463de6563035070a5c48bc30e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 12128 bytes

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