Malicious PDF — malware analysis report

Static analysis result for SHA-256 411ee6d49f8efda0…

MALICIOUS

PDF

67.1 KB Created: 2021-06-10 16:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 22ddfc255d80a9d6b4ebe121af0f5623 SHA-1: e3d80e270b094c6e3a14773ca258bad4e0175b7d SHA-256: 411ee6d49f8efda00395ed0a8eeacba3ca61099eadbbbebcd4ae4d404171308b
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://infrive.ru/pbw?utm_term=speakout+2nd+edition+advanced+student%2527s+book+pdf PDF link annotation
    • https://buwikuzajow.weebly.com/uploads/1/3/7/5/137501860/5929730.pdfIn PDF document text
    • https://xenapake.weebly.com/uploads/1/3/4/3/134353424/xogesal.pdfIn PDF document text
    • https://nefipuximejax.weebly.com/uploads/1/3/2/6/132696351/xajomajozupe_kebaw.pdfIn PDF document text
    • https://luvalebasewe.weebly.com/uploads/1/3/5/3/135326782/3893475.pdfIn PDF document text
    • https://rijagadufe.weebly.com/uploads/1/3/1/6/131606992/tezufo_mijijikisilop.pdfIn PDF document text
    • https://lutitisuputusi.weebly.com/uploads/1/3/1/4/131437948/85f2ff63c0f499.pdfIn PDF document text
    • https://lapunowelozod.weebly.com/uploads/1/3/5/3/135337348/gujojoranokepamawov.pdfIn PDF document text
    • https://wumuretulax.weebly.com/uploads/1/3/4/2/134235352/puwewobozu-pexemunebila-nanikiwaroza.pdfIn PDF document text
    • https://dejuxowiku.weebly.com/uploads/1/3/0/7/130738850/wepetavaluvepu.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/bc4424b6-0b10-4fb1-916d-c05e1779cd87/mozalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef045d43-8cd3-4679-b3d7-2fb1b69f1a63/minecraft_bookshelf_mod_2.3.577_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38365622-772f-48cc-9442-20674fd085a7/how_to_connect_a_universal_remote_to_a_samsung_dvd_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0baf9584-d3b2-4da1-80df-bc7dcae1c33c/what_does_culture_mean_to_you_in_the_workplace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e503634-57fe-415e-8aca-f715d9b8e2eb/whistler_z11r_radar_detector_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e04625-bb3b-4d99-b936-610eb334004b/biwanobokoworisokir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4e9db8-4854-4e2e-8cf0-df992527fa7f/nisam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2828716f-ad4a-470c-9a60-9f0f3d18dddd/53436157128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31604ed9-d12f-4d69-939c-331e46f88d58/jutiboruvojibux.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_off0000c493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC493 5552 bytes
SHA-256: 916db54ca7190510b5f66a45f7db706c2ede87afc947cd2faa9b3ef34c1ecd69
font_01_sfnt_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 14728 bytes
SHA-256: 5ef96d0f63b34151ccf095d011241ee58662e4ea7ec65cebcbf7d7bb1111f745

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