Malicious PDF — malware analysis report

Static analysis result for SHA-256 1414439ce245eb99…

MALICIOUS

PDF

84.8 KB Created: 2021-03-23 17:07:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 724cdcd6f97d3efedda7871c84668294 SHA-1: d8fd00c630dce8c97fbe098ed4cc438a25bf94af SHA-256: 1414439ce245eb99d3c7efb22bb37200328a75944b1c409c034a17b99b1a7f02
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO redirectors and potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further confirm its malicious nature. The primary attack vector appears to be luring users to external sites, likely for phishing or malware delivery, consistent with a spearphishing attachment.

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.
  • 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://druttle.ru/wix?keyword=olivet+high+school PDF link annotation
    • http://viteroludobano.mypressonline.com/everyday_use_theme_analysis.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/13819256670.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/oxford_phonics_world_level_2_teacher_s_book.pdfIn PDF document text
    • http://zonurupadul.atwebpages.com/how_much_is_6000_denarii_worth_today.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_b061a679faf046f2825c1851b8d1c514.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/jasaxepoben.pdfIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_40d2bf7b8d754386a90b3e74ac42391f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee1cd9e-3e65-48bd-9a0f-256524dd9c99/66244235400.pdfIn PDF document text
    • https://e7ee8fec-6806-4cdb-8be5-e75c31c374a0.filesusr.com/ugd/e54fc7_a85c7c6e51f64227a8d440773fed339b.pdf?index=trueIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_8d25b4342234483d80b4aaee33d9fd46.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_0c5aab87d8284d438297503a9cdae9bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/49593997306.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_4723c5a61f244636bf1ae8ad75da68ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/college_algebra_problems_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/comment_calculer_son_imc_formule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2256fd3c-2647-4a6e-b325-b50e633c0de8/24395918075.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/vekojekeritujabejala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a1159a-a14a-4efa-b976-69e41120f02b/are_dyson_ball_vacuums_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/dungeons_and_dragons_full_movie_download.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_off00010f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3D 4844 bytes
SHA-256: fd4f34bbc5c543bf9654432d29a3e1087ca4d4d19d1a9797aca073d59c7d9a5e
font_01_sfnt_off00011fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCA 11388 bytes
SHA-256: f0d996fae5baf6eef1604a5dbb7024515a22999bdd96d529fda28605c4fe3619