Malicious PDF — malware analysis report

Static analysis result for SHA-256 1117b913107016ba…

MALICIOUS

PDF

77.3 KB Created: 2021-02-28 00:33:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4a281fa8a1fb9a47a9b774a355d6ec13 SHA-1: 4925daf5d08a7ff9d5dd854102ac6f04b9a9e1a7 SHA-256: 1117b913107016ba765d8daea37e28da9e628462537623f4c3939dbecac0bf0e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains keywords related to 'Midmark m11 autoclave error codes' which likely serves as a lure to entice users to click on the embedded malicious URLs. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

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
  • 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://mezovuduw.ru/strik?utm_term=midmark+m11+autoclave+error+codes PDF link annotation
    • http://wejuzofibab.medianewsonline.com/excell_power_washer_engine.pdfIn PDF document text
    • http://diletemofuvufu.22web.org/3701967886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_601637d5b9bde.pdfIn PDF document text
    • https://bazusatibewin.weebly.com/uploads/1/3/4/3/134374280/zezuvezadilikogu.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/kodajemesafixiwukipokiz.pdfIn PDF document text
    • https://xekariwunaju.weebly.com/uploads/1/3/1/0/131070431/9763220.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/nusewulu_dadigusun.pdfIn PDF document text
    • http://gusanod.22web.org/whatsapp_app_2019.pdfIn PDF document text
    • https://dixuxizexejo.weebly.com/uploads/1/3/0/7/130740209/b18043c892fa3.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://fidegaf.atwebpages.com/nifekeg.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/xodezazepew.pdfIn PDF document text
    • http://pobifewudej.epizy.com/what_kind_of_bread_can_you_eat_on_a_no_carb_diet.pdfIn PDF document text
    • http://riwexakax.epizy.com/misoprostol_figo_guidelines.pdfIn PDF document text
    • http://fipuxogililego.epizy.com/retubibetukomolux.pdfIn PDF document text
    • http://wejanofe.rf.gd/autocad_lt_command_line_missing.pdfIn PDF document text
    • http://romisov.epizy.com/doj_foia_guide_exemption_5.pdfIn PDF document text
    • http://devisufuxuvit.epizy.com/dakulimamizo.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_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 5044 bytes
SHA-256: 99c1c1914247e62def7df03545eff80f809194e8e7d8ce53901342d598b01023
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 10164 bytes
SHA-256: 166ee6e10f24b276bb797f3cd18c68e831612c1e1c6bcc7828d4019e83a1daa9
font_02_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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