Malicious PDF — malware analysis report

Static analysis result for SHA-256 5726ef4d1f220f84…

MALICIOUS

PDF

77.0 KB Created: 2021-01-25 10:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6a55e56d4a9a683e9e59cf3c23d9a238 SHA-1: ea4747201fba478a385305d710142784b12e6391 SHA-256: 5726ef4d1f220f840f7c16aed7f46b797acf7cf436f387de5e4d7863c22e3bd5
134 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, including one hosted on disposable infrastructure (weebly.com) and another on a suspicious domain (jottigo.ru) with UTM parameters suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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
  • 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://jottigo.ru/aws?utm_term=glow+party+flyer+template+free PDF link annotation
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/bakevuwajizagumabav.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/183265b04d86ae4.pdfIn PDF document text
    • http://jifoxife.66ghz.com/icomania_answers_level_55.pdfIn PDF document text
    • http://kexejadupuna.66ghz.com/datasheet_of_lcd_16x2.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://jevoneloz.epizy.com/gallbladder_polyp_surveillance_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/24644606536.pdfIn PDF document text
    • http://jisixapuwalim.epizy.com/kufovov.pdfIn PDF document text
    • http://sitotozip.rf.gd/60994846057.pdfIn PDF document text
    • http://kowewewabozete.epizy.com/fifobufidavu.pdfIn PDF document text
    • http://wajalapivibobi.epizy.com/adobe_audition_1._5_free_windows_xp.pdfIn PDF document text
    • http://zawidapiwixub.epizy.com/order_of_operations_worksheets_with_answers.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/ashoka_chakravarthy_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/likugibemo.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/xolejitixi.pdfIn PDF document text
    • http://dizakopalelur.epizy.com/voxelewuwazutofurimul.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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 4728 bytes
SHA-256: edad472120e2b50ee035ec26017837b29a36f4bb6fa91d4ceef2de09b495e070
font_01_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 10548 bytes
SHA-256: 97bfb30c4a4f246c1724465f7d9d6af15e8448ea131c867c605215835d9bd6f5
font_02_sfnt_off0001185c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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