Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a9fadb0eda6912…

MALICIOUS

PDF

75.6 KB Created: 2021-05-07 03:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e77c93d4c23379a8121cb1717fd29e2b SHA-1: de71907601e42bdfe0c0509280f8753be4f6a430 SHA-256: e1a9fadb0eda6912113d4dc5eb15a7c194375f30b3ac9788678785ec0100d9b8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, indicating it functions as a link farm. Several heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, confirm this behavior. The ClamAV detection and ML classifier output strongly suggest malicious intent, likely for phishing or distributing further malware through the linked sites. No scripts were extracted, but the sheer volume of outbound links is the primary indicator of malicious activity.

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://dugedepap.ru/strik?utm_term=how+many+calories+are+in+one+sonic+mozzarella+sticks PDF link annotation
    • http://tihefers.online/oblivion_error_code_80092004c5r80.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/bz4je9w/kamado_tanjiro_no_uta_piano_sheet_music.pdfIn PDF document text
    • https://gazulaloruvuv.weebly.com/uploads/1/3/4/6/134693071/lijumewosobozi.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/e1UkkRk/h_and_h_music.pdfIn PDF document text
    • http://fastgetme.online/a_christmas_carol_fx_release_datewsizi.pdfIn PDF document text
    • http://fb-ig-violation.com/pufanorarifr3wdp.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/bda261d1f1.pdfIn PDF document text
    • https://cdn.sqhk.co/repejuvovod/hjhDLij/18437966141.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimofaw/jeic8jc/ropirexifogezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6013aff6700d1.pdfIn PDF document text
    • https://jamofidomub.weebly.com/uploads/1/3/1/3/131398059/vonus.pdfIn PDF document text
    • https://cdn.sqhk.co/razefudixid/XhkNWIp/20955316447.pdfIn PDF document text
    • http://forecast.bet/positive_thinking_word_cloudunkpa.pdfIn PDF document text
    • https://cdn.sqhk.co/vifaduvej/mghghDS/fudefasizofimewej.pdfIn PDF document text
    • https://cdn.sqhk.co/wulozonixuf/1ibhghj/all_in_one_social_media_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/kidimezamos/ikhjEfQ/meruzebexolutabalogaposa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452607/normal_60092a51e1316.pdfIn PDF document text
    • https://cdn.sqhk.co/xadopazo/WiehiGp/princess_coloring_sheet_printables.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/femimufuwo-lazanev-divizuj-gejujixivevada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 5216 bytes
SHA-256: 1b2d4690453ab42fa86a743441ebd0ba8b35987d7f4ced2f24c47cc377725e5f
font_01_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 11588 bytes
SHA-256: 0063ba4300ebd597558ab9689531a2436afedd9dce55d573f93397137842e432

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