Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6593464b8369d9…

MALICIOUS

PDF

83.8 KB Created: 2021-02-22 21:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: dd37bdb12530aeb5f469221cefa70669 SHA-1: 82ea9eaf1a0c4fd49cdae05e12f96b64eb64be23 SHA-256: 5d6593464b8369d99ccbf91a68a79694b57c4eba2cafefced32ee235b8665d8c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be disposable or used for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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/strik?utm_term=ap+human+geography+unit+1+review+packet+answers PDF link annotation
    • http://batmbatm.ru/voice_recorder_editor_and_sound_effectljppx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450145/normal_60051bc6ad245.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/ff35827d2738.pdfIn PDF document text
    • https://lenatazuponos.weebly.com/uploads/1/3/4/8/134888684/fonewojoguzewikiji.pdfIn PDF document text
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/janasanupapamo.pdfIn PDF document text
    • https://sawamamuwez.weebly.com/uploads/1/3/5/9/135992332/zatowoxezal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_5fe63517c849d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425917/normal_600793399db43.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/kerigigokiken.pdfIn PDF document text
    • http://badge-verification-center.com/paduloretetebuweu54ck.pdfIn PDF document text
    • https://jumomemokipus.weebly.com/uploads/1/3/0/8/130874307/dccc2867a4e461.pdfIn PDF document text
    • https://maritomumotoko.weebly.com/uploads/1/3/4/5/134512683/vipokam-rimad-jejibix-ravov.pdfIn PDF document text
    • http://cuzinfo.ru/93040719014qllb8.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/dugad.pdfIn PDF document text
    • https://tajixuxax.weebly.com/uploads/1/3/4/7/134751877/dolejunu.pdfIn PDF document text
    • http://tosety.xyz/financial_power_of_attorney_form_missouriwxuhz.pdfIn PDF document text
    • https://vexepagofebove.weebly.com/uploads/1/3/4/8/134866030/damogezoderizo.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://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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 5556 bytes
SHA-256: eaf68a0c66167d29624b9e787fa37d9f78fbc90987c0c8d777201ffa4646fb13
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 11328 bytes
SHA-256: 54c46b9accdae033b5569662df9767615bc36a35f810d5f0502bfa2b4a034e37
font_02_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 16116 bytes
SHA-256: f8e326b96df6c0457890c6346fd7f60b91beb129051a642dbd03fdf119a21fd7
font_03_sfnt_off00012b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B50 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
font_04_sfnt_off00013902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13902 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19