Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4ecd81d21801d9…

MALICIOUS

PDF

77.8 KB Created: 2021-03-25 01:29:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 191445c258510f9afb7f2564dcc93f10 SHA-1: 85938d5a22e889553a3e4d7d9138d71c3f1ff80b SHA-256: ff4ecd81d21801d9b2e9b4377e8ee21bc33147e0d9ebd2d7e181d8a337fa353d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

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://soxebez.ru/strik?utm_term=personajes+de+la+obra+plaza+del+diamante PDF link annotation
    • https://cdn.sqhk.co/wesuwajil/A5C2igD/demonstrated_effective_communication_and_interpersonal_skills_in_nursing.pdfIn PDF document text
    • https://cdn.sqhk.co/riwoxedaki/jMihmQC/3465639077.pdfIn PDF document text
    • https://juvikawupuw.weebly.com/uploads/1/3/1/4/131409017/begawapadakimum-jexepe-kibaxiberen.pdfIn PDF document text
    • http://alifan.store/examples_of_imagery_in_shooting_an_elephant930x4.pdfIn PDF document text
    • https://cdn.sqhk.co/temegolu/Pm0HJjh/high_school_simulator_2018_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/b49gdif/73796431634.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/cifVwgg/tibezimepofezapupap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_60371dc28f52b.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/3352400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491451/normal_604f330d07c8d.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/w1Fjgjj/zozebakovugivolisuxix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481673/normal_603ed38c8b08e.pdfIn PDF document text
    • https://vixezikuf.weebly.com/uploads/1/3/1/3/131383943/guwexebix_mokozimusezubok_zedutiweziba_mewovawu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375086/normal_5fee6fb0d50a5.pdfIn PDF document text
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/1091338.pdfIn PDF document text
    • http://bas-vorota.ru/meme_soundboard_2019_pro_apk94ot3.pdfIn PDF document text
    • https://cdn.sqhk.co/wolonevavaru/waIqmie/lebara_new_sim_card_same_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406497/normal_6052504aee890.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://witolav.epizy.com/dafogakeneni.pdfIn PDF document text
    • http://koxogulu.rf.gd/discussion_informal_crossword_answer.pdfIn PDF document text
    • http://jofesosozofoso.epizy.com/larval_form_of_echinodermata.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_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 5372 bytes
SHA-256: f3f0d2bfdf2687a2a30f782355b2ca3ff01536778e042e9a19855f4586490ce8
font_01_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 12288 bytes
SHA-256: 8dc879260a3034efa72bedba4697d8ec48fcefa15217eae29846bd334d8c15bc

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