Malicious PDF — malware analysis report

Static analysis result for SHA-256 3012c993ac7401ea…

MALICIOUS

PDF

133.5 KB Created: 2021-04-09 07:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6cac65a8de49d3e14cd14b3b98be5e96 SHA-1: 254cd9bce89c2bba2935f6a58c2f520953c2fbdf SHA-256: 3012c993ac7401ea6f127fc3414bb3423677587ba411d3617bd47fbd84cb3d8b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or a scam. The embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the primary attack pattern of directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=herramientas+de+comunicaci%25C3%25B3n+para+personas+con+discapacidad PDF link annotation
    • https://tizojutatow.weebly.com/uploads/1/3/1/4/131406606/watororizagedinufupe.pdfIn PDF document text
    • http://beliyden.xyz/h1_racer_rc_plane56zin.pdfIn PDF document text
    • http://bridgecommerce.com/4877403827lcuwl.pdfIn PDF document text
    • http://presalon.xyz/audio_beats_pro_2._8_apkntsy0.pdfIn PDF document text
    • http://viresomal.iblogger.org/how_many_formulas_in_chemistry.pdfIn PDF document text
    • http://eu-study.ru/nasb_life_application_study_bible_indexedmqixq.pdfIn PDF document text
    • https://rudoliretumuw.weebly.com/uploads/1/3/4/8/134861944/gogulavubepizu.pdfIn PDF document text
    • https://tenuzovew.weebly.com/uploads/1/3/0/7/130740022/bobitasakorenorerogo.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/3798495.pdfIn PDF document text
    • https://cdn.sqhk.co/rokogikapo/Ydibbjc/strike_fortress_box_apk.pdfIn PDF document text
    • http://hidver.com/the_satanic_rites_of_dracula_english_subtitlesle2kl.pdfIn PDF document text
    • https://vujezogovi.weebly.com/uploads/1/3/5/3/135348950/jujotituxej.pdfIn PDF document text
    • https://xifexovajebim.weebly.com/uploads/1/3/0/7/130740184/fedogupepumeva.pdfIn PDF document text
    • https://cdn.sqhk.co/waderapal/siegcgf/11197300507.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://s3.amazonaws.com/zetituri/gingerbread_man_book.pdfIn PDF document text
    • http://vuremekewema.rf.gd/difiwizofin.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/south_jersey_industries_annual_report.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD27 5164 bytes
SHA-256: 3e5fca919460367e00a9dda9b5c82b192e1a8d0cf068a30f0cd579d0b769afc7
font_01_sfnt_off0001ce4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE4A 12776 bytes
SHA-256: 78f7c12b9a0d600faa530fa33186db38777e81068806b9979199b5329cd2aba7
font_02_sfnt_off0001f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F753 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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