Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3673f3b2afbd97…

MALICIOUS

PDF

75.0 KB Created: 2021-02-28 08:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4322bd3fdd5a61729960bdde5a075b8e SHA-1: ce312f64a043ab2b3dd2aac03bab2af061cad782 SHA-256: 8c3673f3b2afbd979b3e8ebd9ccdd7143e8226ea752ce26c9c5f284ee7264253
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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://botokaw.ru/123?utm_term=black+boy+middle+names+that+start+with+d PDF link annotation
    • https://puluduzi.weebly.com/uploads/1/3/1/4/131453343/nefufuvived_jalinubeweb_fixozukese_femovuziv.pdfIn PDF document text
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/ropexe_tekeviteda_fogoxevoberusa.pdfIn PDF document text
    • https://nutarubanamu.weebly.com/uploads/1/3/4/5/134528768/809efa1e79ac.pdfIn PDF document text
    • https://kemavejikokawi.weebly.com/uploads/1/3/2/3/132303077/wujozera-nosapodezafika-duveve.pdfIn PDF document text
    • https://gojanaribebiw.weebly.com/uploads/1/3/1/4/131437307/wuwoxebofuj.pdfIn PDF document text
    • http://alcexpress1.xyz/jisevubu70uc.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/benuromuz.pdfIn PDF document text
    • https://dopitusorotid.weebly.com/uploads/1/3/0/7/130738794/kajajo-rapowadiwozuku-kavomizege-kadawegeju.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/5841d10.pdfIn PDF document text
    • https://wipigoxexidon.weebly.com/uploads/1/3/2/6/132682030/390133.pdfIn PDF document text
    • https://buzubexod.weebly.com/uploads/1/3/4/0/134017192/vavirerufon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nevozabewovezo.epizy.com/25583840599.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/podojabonikig.pdfIn PDF document text
    • http://todizegi.epizy.com/77593099618.pdfIn PDF document text
    • http://wegolas.epizy.com/commercial_property_presentation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/southwest_airlines_fleet_information.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/application_load_balancer_aws_cloudformation.pdfIn PDF document text
    • http://woxebolinos.rf.gd/dewalt_735_planer_repair_manual.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_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 5628 bytes
SHA-256: 647b476cefd421e08a82c83b188ed47b541d2e228837cbef359396c0331ecda6
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 10500 bytes
SHA-256: 676bf31c53d24ce0e707bfc3836ffbd58385f65043df9f2a36e570ab98be6039

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