Malicious PDF — malware analysis report

Static analysis result for SHA-256 a684be9a1465ede0…

MALICIOUS

PDF

78.2 KB Created: 2021-02-23 11:17:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 27c375d34301599c8c5de3220938d26f SHA-1: 9e5958d6e34724efc5d3f20afab898e5dad34002 SHA-256: a684be9a1465ede007f81fb2e5492037932212789301ef390b834946474ae68e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

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 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://jacksth.ru/wix?keyword=halla+o+haya+significado PDF link annotation
    • https://zanokelalugabu.weebly.com/uploads/1/3/5/3/135315143/78675a4a1824.pdfIn PDF document text
    • https://rudozusaviso.weebly.com/uploads/1/3/4/0/134041113/1438069.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/korufetedigoxedibamo.pdfIn PDF document text
    • https://jumomemokipus.weebly.com/uploads/1/3/0/8/130874307/7147159.pdfIn PDF document text
    • http://lufatomitonad.22web.org/29104279943.pdfIn PDF document text
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/8e17120.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/zixajadavilofifibaw.pdfIn PDF document text
    • http://xapunubezes.iblogger.org/5_yoga_asanas_with_pictures_and_names_in_hindi.pdfIn PDF document text
    • https://lilofuzaxodas.weebly.com/uploads/1/3/0/7/130775659/wuwup-kubitolapobul.pdfIn PDF document text
    • https://jebasunegafepes.weebly.com/uploads/1/3/1/6/131637224/5746594.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/paluvev.pdfIn PDF document text
    • https://napufifibadabe.weebly.com/uploads/1/3/1/4/131406817/vevififowe_sepafenar.pdfIn PDF document text
    • https://sifobidegi.weebly.com/uploads/1/3/0/8/130874382/buxunugu.pdfIn PDF document text
    • https://dasomuduse.weebly.com/uploads/1/3/6/0/136095852/3818533.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fereralud.epizy.com/install_android_sdk_ubuntu_16.pdfIn PDF document text
    • http://lavodusepigixu.rf.gd/iphone_8_plus_camera_apk_for_android.pdfIn PDF document text
    • http://gukasitaxe.epizy.com/webemokenopi.pdfIn PDF document text
    • http://poravilotizeve.epizy.com/71237002327.pdfIn PDF document text
    • http://wufutogaj.epizy.com/c_o_kancharapalem_full_movie_720p.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_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 5248 bytes
SHA-256: fe18050e88330360ed8019cb39854894cb5ae15a6bf0f624c34e82479dadafa6
font_01_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 11688 bytes
SHA-256: 898805463cf2cb98cd1494a8029349ada167ff4bd4cebbe47e3deb639dabc678

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