Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17bf71139d5de30…

MALICIOUS

PDF

79.0 KB Created: 2021-03-09 20:09:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ae96cd176e68365b02088516e00fb4ca SHA-1: 3df2a74dfc91f0163580cf4b1f6b6502ed580588 SHA-256: e17bf71139d5de30db8ac36797bdc68db164593aa06754e840b6fa9adf3c9b92
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness, with the links likely serving to manipulate search engine results or lead users to phishing or malware distribution sites. No scripts were extracted, but the presence of numerous external URLs suggests a phishing or content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/award?keyword=nc+coordinate+system+pdf PDF link annotation
    • https://cdn.sqhk.co/tibakekavero/hjjarfm/rangers_race_transforming_heroes_3ds.pdfIn PDF document text
    • https://tebifenan.weebly.com/uploads/1/3/4/6/134675993/0c63bb612.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/hggeuoK/21672668009.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/I4WTgdM/applock_pro_fingerprint_pin_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tugirujozi/vqsDian/3186160405.pdfIn PDF document text
    • https://cdn.sqhk.co/kamupudoro/gf3J6gj/tabletop_xmas_tree_with_lights.pdfIn PDF document text
    • https://xoxitugupara.weebly.com/uploads/1/3/1/3/131383959/bivefef-mazesi-nefer-tibuzilasa.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/HheWzhi/tamil_stickers_for_whatsapp_wastickerapp.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/nixidurotor-sudodu-bazasapuduko-pediwadum.pdfIn PDF document text
    • https://xovozenoz.weebly.com/uploads/1/3/4/3/134348708/pigaripo.pdfIn PDF document text
    • http://pinudub.iblogger.org/how_to_remove_a_shower_handle_moen.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/ijndZjc/horror_zone_pipe_head_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/ijAhieG/nowobofolibej.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/mawuzepiboxogubo.pdfIn PDF document text
    • https://xoxaworik.weebly.com/uploads/1/3/4/0/134012931/7517193.pdfIn PDF document text
    • http://sezidagajajam.iblogger.org/form_4_biology_book.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/nitajosasa/picadora_de_carne_manual_antigua.pdfIn PDF document text
    • http://validexa.epizy.com/2019_dodge_challenger_sxt_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/sokepefofizo.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/xuvefanewakuxupopumolik.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/lovely_professional_university_date_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/what_is_the_best_orientation_for_a_house_in_ireland.pdfIn PDF document text
    • http://nasedelowose.rf.gd/books_to_read_in_your_20s_female_fiction.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_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 5340 bytes
SHA-256: 11df0302d8cdfda1a6fbf09e9c8d0d32c03b92994e5220204e4d05ca070b1927
font_01_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 10512 bytes
SHA-256: 7d405b342eacb6610b131f1e087fba4c29ccbfc79fe61abc549aa6bb64dc4276