Malicious PDF — malware analysis report

Static analysis result for SHA-256 4881de3cea430bbf…

MALICIOUS

PDF

73.4 KB Created: 2021-04-05 23:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 114b78908835738f3eb8d4d2e1f7cbaf SHA-1: 9c5fc7a92ef162e4ad0609cf75d21aaa8652b13f SHA-256: 4881de3cea430bbff595fb2cc5bb8eb937af83f6a8fe04b30a509de2fcefac3e
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious redirector links suggests an attempt to lead the user to a phishing or malware distribution site, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=michelle+beatles+piano+chords+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4368504/normal_5fc91d0f654d5.pdfIn PDF document text
    • http://rewita.fun/partitura_careless_whisper_saxo_altoj9bpv.pdfIn PDF document text
    • https://fexifeter.weebly.com/uploads/1/3/4/6/134612515/4350532.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/78dddd25a491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_605fd3b56cc57.pdfIn PDF document text
    • http://omerkatanalp.com/25193285943q0cu1.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/8020260497.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/sukoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_601fd9d905839.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/niveles_de_prevencion_salud.pdfIn PDF document text
    • http://wide-mean.top/32272017997nczaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495974/normal_5fdf514730b8f.pdfIn PDF document text
    • https://fakavenudir.weebly.com/uploads/1/3/4/0/134042443/likulitadof_fawuvanuna_merit_xudozatabupu.pdfIn PDF document text
    • https://xodumusekow.weebly.com/uploads/1/3/4/7/134708755/6472171.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5fc62ffef24fa.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/57139717343.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/pukunowexine.pdfIn PDF document text
    • http://italystore.pro/zx_spectrum_games_pce2mp4.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/1043938.pdfIn PDF document text
    • https://feboxonifi.weebly.com/uploads/1/3/4/7/134767271/xojadevalona.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/tesotiwapax/clash_of_clans_apk_day_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/55234124072.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/activeperl_32_bits.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_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 5388 bytes
SHA-256: 3f07f9dc4b6ee1e0d7f0c20891d02a9e761399814e59455ee88a63b5d5764661
font_01_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 11204 bytes
SHA-256: 7a0a37c4fdd19134e43cbe87c29f47aeab2e094e38833de6aceaf8f343f23cc6

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