Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e920c6ace207b0…

MALICIOUS

PDF

76.4 KB Created: 2021-03-30 12:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 832e19780ce8744090b163b12eb671f9 SHA-1: 5ba406e5032c82757a23b52f37146c31de3eba53 SHA-256: 48e920c6ace207b03118b39cd422928f6b191e0db2c376f781c83290a4f714fc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the document body and embedded URLs point towards a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/award?keyword=abeja+definicion+pdf PDF link annotation
    • http://mazafaka69pussy.online/gehalt_servicetechniker_hermlez6plb.pdfIn PDF document text
    • http://blaugrana.ru/1410359256mwb4r.pdfIn PDF document text
    • http://stav-games.ru/canon_inkjet_mx300_driverspuje8.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/telling_time_half_hour_worksheets.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/dewalt_dw715_review.pdfIn PDF document text
    • http://kalukawuwo.mygamesonline.org/sonic_drive_in_menu.pdfIn PDF document text
    • http://reduslim-europa.site/adverbs_worksheets_grade_28ohlm.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/xedot.pdfIn PDF document text
    • http://raisinsapp.club/fiwasofeleputipa9wsgq.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/how_to_pass_permit_test_ga.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/42561336821.pdfIn PDF document text
    • http://kushtanash.ru/74419145843f4j00.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://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_740cbd9f07e8496a8dc7d1e4c8ded1e8.pdf?index=trueIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_85ac214759be49bbb62d0452af291cfd.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_ab29b01b8c5a42dcb9068a2084e84694.pdf?index=trueIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/mezotudokudadazisomewufuv.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_92de2c6ba13e416e8fb013ebedb8e495.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_f41b85d014b4474e8207cba60243706a.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_bc2c32b917ed4e71803dd65bb489fc9d.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 4756 bytes
SHA-256: 4bb714e73950987d753a7bdd13f7b487c472be66306e5561619ce2964fec6d6f
font_01_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 11492 bytes
SHA-256: 3d6c5178df8c4612dac49f1ff8adeaefcddc448ce71a35aafd474534c6521c67
font_02_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333