Malicious PDF — malware analysis report

Static analysis result for SHA-256 13409c70a04816ca…

MALICIOUS

PDF

77.1 KB Created: 2021-02-05 11:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 28b4db599a8bcfc20b9cddd97d04538a SHA-1: a315abc214139b50015a1c7fab6b754f28eaa5dd SHA-256: 13409c70a04816ca51b3103981e8d5b2db275186729ef186459e1ec8cb9835db
252 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external resources, many of which are hosted on disposable domains or known redirector infrastructure. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, suggesting it may be a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=basilisk+the+ouka+ninja+scrolls+parents+guide In PDF document text
    • https://bugebapujeze.weebly.com/uploads/1/3/1/6/131606260/09f1bee624.pdfIn PDF document text
    • https://kavirozix.weebly.com/uploads/1/3/3/9/133999962/f585aacd0eae24.pdfIn PDF document text
    • http://eroganoficial.site/videos_like_de_amor_cortosvbh4s.pdfIn PDF document text
    • https://cdn.sqhk.co/nawafoxobok/f7gdPsr/yellowstone_cast_2020_season_3.pdfIn PDF document text
    • http://nimolebefiv.22web.org/61226042667.pdfIn PDF document text
    • https://pigikitukapu.weebly.com/uploads/1/3/4/6/134693564/rebebuzuxuj_minob.pdfIn PDF document text
    • https://savibivo.weebly.com/uploads/1/3/1/3/131381036/76693.pdfIn PDF document text
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/55408df5c.pdfIn PDF document text
    • http://imkl-checker.com/60545495668esm2j.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/jgniagg/93194027479.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/UhTsd34/lasenabanevud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zugiwonurubenaz.epizy.com/bls_test_questions_and_answers_2018.pdfIn PDF document text
    • http://ruxuwidoke.epizy.com/american_tv_guide_new_york.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 5408 bytes
SHA-256: 4e9d5c3915609cf16163809aa999f2c5f82b10e03fc70fb4de96b34d35cac601
font_01_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 11176 bytes
SHA-256: 0d9963b58c6b2bf24685a5e1e66cfdfd451cb87af68ff1a16d77a76e84b89118
font_02_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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