Malicious PDF — malware analysis report

Static analysis result for SHA-256 7426e4c1007b7024…

MALICIOUS

PDF

79.6 KB Created: 2021-05-25 00:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b1e42c8ace9709ffd5324d6dfdf022b1 SHA-1: 22c90079191d9dce3e472d7e16efe16a6949d71c SHA-256: 7426e4c1007b7024701e407b9e8a8f7923204e9e182b4b2fee72cf7e116c17c1
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a redirector URL that appears to be part of a phishing or scam campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a large number of links designed to attract users, with the primary lure being 'installing hurricane shutters'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://lozipotod.ru/strik?utm_term=installing+hurricane+shutters+on+sliding+glass+doors PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5ff4a0d9b360b.pdfIn PDF document text
    • https://xoluvaxabezil.weebly.com/uploads/1/3/4/3/134338990/1df74a1776b8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381541/normal_5fe0b40128c2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5ffe41d52bb26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465025/normal_5fc59ffc6729f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_60418600797cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368985/normal_5ff80e848290c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_6033565ae3ebe.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/poromixo-vuvike-tejud-lefesalepen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zamemigojat/davusikipaluxizab.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/31182206264.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/wefifotopagudigazeforetoj.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/metodologia_dela_investigacion_de_roberto_hernandez_sampieri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced1197b-b9a6-4944-9142-a79dd4ebccef/what_is_better_herbalife_or_310_shake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2507a3d6-ac9c-4fa0-8dc7-8c578f42f1a8/search_google_with_image_instead_of_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ce8234-08fe-4f62-8b7d-38c89b26de1b/hound_of_the_baskervilles_chapter_5_and_6_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/fo3_garena_vn_game.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/precalculus_with_limits_ron_larson_6th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/xetodovopasilej.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/rmlau_back_paper_date_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/gavanupuke.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/bagafa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 5020 bytes
SHA-256: 44987374f24e78f73d2ed56ea982b36a780034eb111c9617d207aadc3540a7c3
font_01_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 10432 bytes
SHA-256: 1e6589775a486f389a54ab53492d2040f7b35be5a82e7e46654a05788e8fbec3
font_02_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230