Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf1e55e30845b51…

MALICIOUS

PDF

68.7 KB Created: 2021-03-24 01:16:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 75876bec2c2cad147de91011612459fc SHA-1: 5a88538c6000d13199fadff983032e85ca541bfb SHA-256: cbf1e55e30845b5184105345d4013251a1b77e033824e3929f9c6812f6909973
194 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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://pelibifir.ru/award?keyword=barron+s+gre+psychology+7th+edition+pdf PDF link annotation
    • https://lelidejob.weebly.com/uploads/1/3/4/6/134643066/6687222.pdfIn PDF document text
    • https://kuvikupomudu.weebly.com/uploads/1/3/4/4/134457818/6205915.pdfIn PDF document text
    • http://jilavixit.medianewsonline.com/the_bastard_of_istanbul_online_free.pdfIn PDF document text
    • https://wiwanozamo.weebly.com/uploads/1/3/4/3/134306351/temudelutoxagu_xotikosafob_xonewomupirejiw.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/university_of_colorado_denver_electrical_engineering_faculty.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/sharpening_stone_kit56av9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460233/normal_5fe87595b1670.pdfIn PDF document text
    • https://nerutaraludu.weebly.com/uploads/1/3/4/6/134672403/ribigoxamajebabigako.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484370/normal_5fcf6e96c3f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_603be36653167.pdfIn PDF document text
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/tudikefifikuf.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/xaxidirosaweg-dowawafaka.pdfIn PDF document text
    • http://doucheapp.xyz/can_i_watch_youtube_on_kindle_paperwhitel215m.pdfIn PDF document text
    • http://funseeds.site/zen_and_the_art_of_happiness_by_chris_prentiss24bn1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394062/normal_5fe756d68763e.pdfIn PDF document text
    • https://vufofameti.weebly.com/uploads/1/3/0/8/130874118/jobor.pdfIn PDF document text
    • http://usechambre.xyz/xazopuwesosasanozawufuz19nj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/9615330887.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/lapodopa.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/using_vba_functions_in_excel_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/calendar_template_excel_december_2019.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE21 5648 bytes
SHA-256: 8789c13f32d22313803a4fef5fb73454b58c3dd8efa62f69bb6ffa357d6dcef0
font_01_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 10480 bytes
SHA-256: be193c2d4fb74a0108559d9484db9aa88692a7799c14b8590432e817d4db5986