Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7a8404cfc2ae44…

MALICIOUS

PDF

75.5 KB Created: 2021-05-18 04:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9d35d180cd6b3a8bd44b772f27c9baa4 SHA-1: cebe25087c2ca64ce038d8f5e4e8367bcc904f97 SHA-256: 0c7a8404cfc2ae445436f4fb6f79c568709b74b5bb8792bfa05d379c751ad764
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to a redirector URL that appears to be part of an SEO link farm designed to lure users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://leonvi.ru/strik?utm_term=ways+of+agreeing+and+disagreeing+in+english PDF link annotation
    • https://tisalupiruj.weebly.com/uploads/1/3/4/0/134018152/zuduxirukazum.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/634160.pdfIn PDF document text
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/f009de0cdc.pdfIn PDF document text
    • https://zozolunefa.weebly.com/uploads/1/3/5/3/135325744/b4f46be3.pdfIn PDF document text
    • https://bumiwawewa.weebly.com/uploads/1/3/5/3/135343946/rigitopumaxofewuka.pdfIn PDF document text
    • https://pibefabetanob.weebly.com/uploads/1/3/4/3/134376782/ziril.pdfIn PDF document text
    • https://likimipezerejo.weebly.com/uploads/1/3/2/6/132682052/fafb408b0c.pdfIn PDF document text
    • https://niwitibu.weebly.com/uploads/1/3/1/6/131636677/kumubapejakuv_xigukug_tukil.pdfIn PDF document text
    • https://wugepugozufov.weebly.com/uploads/1/3/4/7/134744675/b85c46824d9e.pdfIn PDF document text
    • https://bedaruwi.weebly.com/uploads/1/3/5/3/135326402/bebulogalosapele.pdfIn PDF document text
    • https://dotozirijekuzo.weebly.com/uploads/1/3/4/3/134315872/padif.pdfIn PDF document text
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/jukuxipufag-togadiwu.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/pibabopuduj/zawuwapol.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/how_to_make_good_art_on_procreate.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/gegagowozilobem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8ccc64-0a2c-4fb6-b6e0-13710af6d5f5/adventures_of_tom_sawyer_movie_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/marketing_management_by_philip_kotler_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac97177-9334-4420-84b7-338fd9ae4bde/wubodeboju.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/restaurant_flyer_design_template_psd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29cf7d8a-39ee-4da7-8420-bb358e215293/62442029086.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/how_to_calculate_formation_constant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a13e3fa-c8e6-4de7-9c8b-e075ce10a81f/86868864337.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/proper_bibliography_format_apa.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/buell_xb9_performance_upgrades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1e5d9c-07e7-4aba-9dd1-68028f046249/what_is_the_dewey_decimal.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/veporugoboxijesule.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_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 5284 bytes
SHA-256: 5e3d40cb3fb27d9948266c2d25af3ff2fc5c76a0844c45bbdabd34823db0201a
font_01_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 10592 bytes
SHA-256: 207d87fec0b4ccab00695a73046858fe7eecd16f3ce8dc301253ae3eb120e081

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