Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d338df9e56eeddc…

MALICIOUS

PDF

104.6 KB Created: 2021-03-25 10:59:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1cdac77326dd8c8d1e3066ae8e04647a SHA-1: 8f2cc0fa0d7d98f61c1df663016a4319032ed55d SHA-256: 1d338df9e56eeddc3f15ed72c07478a8eb405902ac358ee6ad6b2a93ddb68f9d
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting or potentially malicious domains, indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards an attempt to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/award?keyword=applied+data+science+columbia+pdf PDF link annotation
    • http://lastasked.com/cells_and_tissues_anatomy_and_physiology3l4pj.pdfIn PDF document text
    • http://meriline.store/high5_manual_rosin_press20scd.pdfIn PDF document text
    • http://idealica-italiaoficial.site/fujitsu_document_scanner_fi-7160gwshh.pdfIn PDF document text
    • http://rodina38.ru/how_much_is_the_joining_fee_for_planet_fitnessfi4v1.pdfIn PDF document text
    • http://mafewagidimu.22web.org/93504918542.pdfIn PDF document text
    • http://ita-talia.fun/if_clauses_exercises_islcollectivee8686.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/kagedatabujo/what_is_developmental_perspective_in_social_work.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/12785136565.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_d75ada988ac64f2286e2c39c5c2b4525.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_8436166034a8463ab60fb326b41a062e.pdf?index=trueIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_9366fa1518224bcd83c53652cbf5ccb4.pdf?index=trueIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_6bfb5c1f43b84e15962bd854ed5069a0.pdf?index=trueIn PDF document text
    • http://mijugavagi.epizy.com/funeral_march_sheet_music_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed7eb8f0-ea77-43af-b275-42133a0fc29c/zumarewivavawu.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_433b2b15ee334a9489cf0258ef2a20ab.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_13e6b027d49546259161c0377369c228.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_921e389931d9463b946dba14f13e04fd.pdf?index=trueIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_eedda1b054f245e5868966abc2efef10.pdf?index=trueIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_18bbf9dfbb8842908f2d7b37f2c952aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4730ea14-b42b-4898-9843-0da4eed3f7e7/programming_in_c_practical_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/6896167612.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/bar_chart_questions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001454a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454A 5332 bytes
SHA-256: cba17e1fc619fd343fdebc0716da67bc6ebdeebc4bfab50c6fe22cf1d3a708c7
font_01_sfnt_off0001575b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575B 11752 bytes
SHA-256: c2af9c8c750794ebb11c56696dbd9fb5444bd2843fb2fc6b83313512ccde087e
font_02_sfnt_off00017f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F4B 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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