Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5194e70420a5eb7…

MALICIOUS

PDF

86.6 KB Created: 2021-03-02 17:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 28503fcc64a87e441d50df5e4ab6aca9 SHA-1: a57ba0fbfe386c46342e9136ca58d26b1188c043 SHA-256: e5194e70420a5eb7cea8824e35ae5060e3a80f3bfc4a7e73e92c53ccd4aa5e2d
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/123?utm_term=how+to+change+the+rubber+seal+on+a+washing+machine PDF link annotation
    • https://cdn.sqhk.co/menigopas/jH2iigj/lekumezal.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/jdiaYRW/payrange_hack_apk.pdfIn PDF document text
    • http://kazexezawulozij.mypressonline.com/83082326161.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/bjhjdhe/car_payment_calculator_with_tax_and_down_payment.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/ieniggf/35345923471.pdfIn PDF document text
    • https://cdn.sqhk.co/zidomirit/8gjLhiN/lesozipajikuvunonixolexam.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/fanararomotu.pdfIn PDF document text
    • https://cdn.sqhk.co/basinasedu/hbv8jjc/51905100203.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475565/normal_6009223f2fbe3.pdfIn PDF document text
    • https://cdn.sqhk.co/nulogoxeja/hh5jghx/red_ball_4_volume_2_level_14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pubikuvudara.epizy.com/nuzuluf.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/ejercicios_de_operaciones_combinadas_con_fracciones_2o_eso.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/11690417097.pdfIn PDF document text
    • http://xegefonupekowa.epizy.com/41812080711.pdfIn PDF document text
    • http://bojonovaja.rf.gd/31048490474.pdfIn PDF document text
    • http://sujemitusosida.epizy.com/las_reformas_borbonicas_en_america.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 5408 bytes
SHA-256: 4fb25a30bd020335d63b74e8ee5145d0447272a063678174b66071fe24a60058
font_01_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 10788 bytes
SHA-256: 2a2469f1396e03350c0c56bc92da09973627fb5bf85c8f6d23205b8270b67bec
font_02_sfnt_off00013773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13773 16148 bytes
SHA-256: dbe1f6873dfbc63a557840fa26764ed1e24daf10180a919a5f50e881975b6f06

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