Malicious PDF — malware analysis report

Static analysis result for SHA-256 6257f9453a589e90…

MALICIOUS

PDF

77.2 KB Created: 2021-01-26 16:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3ff646d6b1a505c90f618c8912e432b3 SHA-1: 9d3e41e3be927aafbe4385066840a536424a6014 SHA-256: 6257f9453a589e901553ae26cf2bff2211fca8bde0cee9b4b96d88ce510a0703
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF hosting sites, suggesting a link farm or phishing campaign. The primary lure, 'Eliminar los anuncios de google en android', combined with the high ML and ClamAV scores, indicates a malicious intent. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=eliminar+los+anuncios+de+google+en+android PDF link annotation
    • https://cdn.sqhk.co/kosibowo/iikgjuF/63435455860.pdfIn PDF document text
    • https://sixikubirosepup.weebly.com/uploads/1/3/3/9/133997641/tujov-niwojagomogax-miravejijufima.pdfIn PDF document text
    • http://buviturowugigew.66ghz.com/conservation_of_energy_and_momentum_worksheet.pdfIn PDF document text
    • http://idealicaitalia-official.site/pugipitunetazevizojovlccan.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/ejgojhx/258016965.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidaxiwuk/ojhxjbz/fabojoxiximoxogewodoru.pdfIn PDF document text
    • https://vuzanodunujow.weebly.com/uploads/1/3/5/3/135350892/34ce2.pdfIn PDF document text
    • https://tovuwofox.weebly.com/uploads/1/3/4/7/134731163/gelolimudajakonisi.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/hcynlhc/age_of_war_4_download.pdfIn PDF document text
    • https://xuwobonamufaguw.weebly.com/uploads/1/3/5/3/135315698/tuwisemiferaket.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wisuw/31775845965.pdfIn PDF document text
    • http://zoxuwabemowel.epizy.com/6634924456.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/19856755823.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/61337407828.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/pyxis_medstation_es_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/bokexatafujadupuvelizi.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/pejevanajujixepipix.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/alaipayuthey_tamil_movie_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/gibewep.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/divine_divinity_original_sin_2_crafting_guide.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 5216 bytes
SHA-256: 0450f29d97895ea0b184147f6a6f189cb9ac9f22b434fab35475ccc3d3f4d978
font_01_sfnt_off00010089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10089 11416 bytes
SHA-256: 49187fe6655391df99ce1c97897a437b93a4faa77370d992c4cd3a75fd3063f4

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