Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b40a7ab0ba7dcf…

MALICIOUS

PDF

82.5 KB Created: 2021-06-03 12:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4435a290356e79ebbc9928c28158c975 SHA-1: dc42284cbf063d9041ad5ce43259d0045289a3a2 SHA-256: 26b40a7ab0ba7dcfa8c77a9df29981fbdab15820e24718818a5f92110cb2fc12
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pistant.ru/pbw?utm_term=adventurer+conqueror+king+player%2527s+companion+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485322/normal_602fc54f21f9e.pdfIn PDF document text
    • https://balijijileg.weebly.com/uploads/1/3/4/5/134505585/7227ce27738e2.pdfIn PDF document text
    • https://dedemapisiwopiv.weebly.com/uploads/1/3/0/7/130775251/vodinadamudela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_604c9c0a30f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_600dfde429ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_6021558655d9e.pdfIn PDF document text
    • https://dojukigefob.weebly.com/uploads/1/3/4/5/134577696/rinepuzixi-wixubafik.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/jinirexop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412568/normal_5ff8135cc3d04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5f6f2e-b7a4-418d-b2d3-0a81c3dfa6b1/ruliruxedafej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b4fd687-0369-41dd-a453-30d7c255f694/13971813804.pdfIn PDF document text
    • http://fetinaduv.pbworks.com/f/literary_elements_in_chapter_12_of_to_kill_a_mockingbird.pdfIn PDF document text
    • http://bilabegape.pbworks.com/w/file/fetch/144480807/is_proheart_safe.pdfIn PDF document text
    • http://jujupaw.pbworks.com/w/file/fetch/144555543/nevawevetikebak.pdfIn PDF document text
    • http://redelaw.pbworks.com/w/file/fetch/144533952/vampire_diaries_season_1_episode_1_english_subtitles_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d220d6f-780c-46da-8c8e-4f34069d4aed/clases_de_ingles_basico_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead84ee0-24c7-4658-bc0f-2c93a03243cf/85502217196.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/oxford_advanced_learner_dictionary_9th_edition_free_download_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14bb8f5f-92a5-4763-82f7-63c4fc1d8c20/14469718693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/714858d7-7322-470e-99df-ec02a940679d/xitelawokerabobuwoza.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_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 5848 bytes
SHA-256: 33482d6116bb073d6a8d83dd053bb50b0a5eeb8e7090faafade20260a030cdc3
font_01_sfnt_off000116b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 11108 bytes
SHA-256: 7da81eed266104ea742c814731045e11e4f07cf632e535b76b6d3ce3a2eda3b0

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