Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c1c779ccb56714…

MALICIOUS

PDF

62.5 KB Created: 2021-02-13 00:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 65a61c53df26b1b2480e6da7e01dc6b8 SHA-1: debaf1f740be16b89e4facbe4ac3fda06cca0176 SHA-256: 92c1c779ccb567148d0a6b48f94f6cba89e06734d581a8df509d5bb5bebdb54e
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to a school bell schedule, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=west+covina+high+school+bell+schedule In PDF document text
    • https://static.s123-cdn-static.com/uploads/4418185/normal_6002547acc845.pdfIn PDF document text
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/duwekimujetawor.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/34285.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/DPnYlhd/12701676221.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/Y5DamGF/littlest_pet_shop_toys_ebay_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_601103da5deaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382779/normal_5ff33d765724e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sodarag.epizy.com/healing_chakras_guided_meditation.pdfIn PDF document text
    • http://jenofabejuvokag.epizy.com/zidepizamuwitepejapu.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/viwesizafa.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/formato_apa_para_bibliografia_online.pdfIn PDF document text
    • http://wixuluvad.rf.gd/free_autoloader_blackberry_z30.pdfIn PDF document text
    • http://sivonimowonaze.rf.gd/ponerabimipetapiwexegeduk.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_off0000b74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74C 5316 bytes
SHA-256: 73adf55137c30f8615d45dea5741b3502bd067fc023e8ffbb994453cf1e42dcc
font_01_sfnt_off0000c975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC975 10524 bytes
SHA-256: da1e32c005064e4d6c1202c4f410616e01e1cd7c8a479b5fc6e4a96810d8588a

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