Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a55bb7a45e72ec…

MALICIOUS

PDF

68.5 KB Created: 2021-01-25 22:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 7be5106a8b12f175355f5b61a4ca5f96 SHA-1: af2699d40abd88b2ba2ce4ffafba8956b78348cf SHA-256: e1a55bb7a45e72ec56f2b042c651cfe535f8fba7912959cba19868bb5d2c3ce3
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains numerous external links, with a critical finding indicating a PDF link farm designed for SEO purposes, pointing to URLs like 'http://kmplitka.shop/switch_pros_mount_trayrwele.pdf'. The presence of 'PDF_SEO_UTM_REDIRECTOR_LINK' suggests a phishing or malware distribution scheme using redirectors, such as 'https://bologen.ru/123?utm_term=set+piece+greened+and+ribbon+edge'. Although no scripts were explicitly extracted, the PDF structure and link farm behavior strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://bologen.ru/123?utm_term=set+piece+greened+and+ribbon+edge PDF link annotation
    • http://kmplitka.shop/switch_pros_mount_trayrwele.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/jf47gjP/numbers_1_to_100_in_french_games.pdfIn PDF document text
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/vufonatolidokof-nomozuwujuxeti-karamal.pdfIn PDF document text
    • https://loseseseveru.weebly.com/uploads/1/3/0/8/130813975/1755125.pdfIn PDF document text
    • http://reduslim-europa.site/sagugasubewugepikilunotoswe9ol.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/difigKI/wwe_payback_rumors_2020.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/tobaziw/baidu_browser_option_problem.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/the_circular_flow_model_applied_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/ostrich_farming_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/20451575315.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/ragepajexafi.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_off0000cbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB9 5272 bytes
SHA-256: bb7923a1f56623181e839aed2f14610198c7f7f102084ffaf3bcbf66e5b610ca
font_01_sfnt_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 11632 bytes
SHA-256: 9ac626e227d15195ce65519ac06db30388954f69881778c5f8e3b694b031c77b

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