Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccbaf54397f40b0…

MALICIOUS

PDF

94.4 KB Created: 2021-04-03 05:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d0465774a6578f5b0044bc9159d1ac0b SHA-1: 2266cb02c23ed1b5a8bd0ef20d4bd3f7a3c2973b SHA-256: 8ccbaf54397f40b0bb66a8acb734885a3db1eff1ca91bb1ee8847d5350e082a0
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to potentially malicious or SEO-farmed domains, such as 'ponafet.ru' and 'lakuberik.mywebcommunity.org'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/123?utm_term=automatic+call+recorder+application PDF link annotation
    • http://lakuberik.mywebcommunity.org/murorazuxalaxexubokabasiw.pdfIn PDF document text
    • https://wikaxefukefep.weebly.com/uploads/1/3/4/5/134519338/70ca24c0f.pdfIn PDF document text
    • https://gitokivoj.weebly.com/uploads/1/3/4/3/134316846/lekosil.pdfIn PDF document text
    • https://letolikasepa.weebly.com/uploads/1/3/4/6/134625664/vajuxufavuvese.pdfIn PDF document text
    • https://tajezutudod.weebly.com/uploads/1/3/1/3/131398094/nawolilonaligeka.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/fisulefajow/low_oxalate_foods.pdfIn PDF document text
    • http://fuzolegogi.atwebpages.com/96173053875.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/80411033641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147af944-cbb3-40b0-a4d9-55d149566dd4/accu-chek_aviva_plus_kit_coupon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6090c17-b66b-4919-b015-896279887599/rumavuguburukule.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/what_is_reys_bloodline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/776b6fa8-334e-40c6-a710-b4054ce6d7cd/zikapozulobora.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/unidad_4_proceso_de_elaboracion_de_una_investigacion_documental.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/modozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57aa82f4-690f-43a3-868b-a99fcee1cf17/4797182282.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/tcode_for_debtors_ageing_report_in_sap.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/dewufoneroderubeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec9eb61-727f-4bfa-b977-793abe6afd6e/how_often_to_change_trane_furnace_filter.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 3364 bytes
SHA-256: 39b3ce8d504a2898584134b8c77cd506da831fc296363bbc6d1b37e14b1616ac
font_01_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 5028 bytes
SHA-256: 158607d856e7762b4715004a33a5658502de7dfd1a3c1eb4508f114b063e7f9e
font_02_sfnt_off000117cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CB 6504 bytes
SHA-256: a304493fffeb182b01808cbccd3936c898fcb1ca56b70c0c0b727d8647ab7b61
font_03_sfnt_off00012ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 11468 bytes
SHA-256: 323614545e75854a26ff5e530ef2d9203e83084b5ca5c2879f62f7d60994d6b5
font_04_sfnt_off000155f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F3 16252 bytes
SHA-256: 92bf62a6da8e542e7986de4a05617492515b4688cacbc6fe62f98bb43f07f6ff

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