Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c1ef5130951241…

MALICIOUS

PDF

78.0 KB Created: 2021-02-28 02:27:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ac5a1ef39f7c96f416bcc6d69b04b376 SHA-1: 94a503b347a35fe81219074102240bef51a92ab4 SHA-256: 27c1ef51309512415957a6aa5c04cf25e767c2905dd70b8f6e7423c2de7f8908
244 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many pointing to disposable hosting, designed to redirect users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/award?keyword=how+to+reset+a+kindle+2nd+generation In PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5ff96c8983745.pdfIn PDF document text
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/5317615.pdfIn PDF document text
    • https://wujiwugamibi.weebly.com/uploads/1/3/1/3/131398142/da312.pdfIn PDF document text
    • https://mukoxawav.weebly.com/uploads/1/3/4/6/134627731/08fa9182b5e.pdfIn PDF document text
    • http://kafemefiturokuk.22web.org/foxaselun.pdfIn PDF document text
    • https://jidedenevunuva.weebly.com/uploads/1/3/4/4/134498736/kulumimapotegos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369781/normal_6004f6bd73e9f.pdfIn PDF document text
    • https://jokuduzasaru.weebly.com/uploads/1/3/1/3/131381103/7413329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_600f58d9c5bc2.pdfIn PDF document text
    • https://mabudorowux.weebly.com/uploads/1/3/4/4/134458492/f72d69aeca2.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/bafalozor_manipamifimi_wupuvuwiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5fd27c458e845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5fd63494acf3a.pdfIn PDF document text
    • https://fepanaxowa.weebly.com/uploads/1/3/4/3/134311119/2aeb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5fd254418bc0b.pdfIn PDF document text
    • http://mugilexarepe.iblogger.org/57340768113.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376371/normal_5ff666d82eb3d.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/lolijexejomak/32911093144.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/dewalt_dw713-xe_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/aala_re_aala_video_song_pagalworld.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/picsart_gold_mod_apk_latest.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_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 5240 bytes
SHA-256: 692b15bd9e5ada4e82dcd57c13073a23a0d55c9aea0491cf185935c4d3ceb089
font_01_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 10568 bytes
SHA-256: 774e9cd295185028a101688596b248835943cd690043afa292e1d77ba9ba7331