Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6ee91218a0c59c…

MALICIOUS

PDF

97.8 KB Created: 2021-03-26 11:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8a2a081a7dbb46a5050e46c995c8cd54 SHA-1: bc37dea1ea994620c70dbb984866ba5306fb0480 SHA-256: 4f6ee91218a0c59c44da288731bbfe47b2c2535b84e068ccb93c6409f373cc5f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/123?utm_term=android+smart+tv+box+malaysia PDF link annotation
    • http://mujoxoluvisukid.getenjoyment.net/frame_relay_notes.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/soxipawinokuli_zopamidepu_wixomu_malutoneperov.pdfIn PDF document text
    • https://zozizifubigidoz.weebly.com/uploads/1/3/1/4/131409074/rigoxidagotanuluveg.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/lorolewoviri-tonagexiviwovu-zevadumovagim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_603e903c9656a.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/7819078.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/projective_geometry_and_its_applications_to_computer_graphics.pdfIn PDF document text
    • http://larebalin.mypressonline.com/77173382823.pdfIn PDF document text
    • http://widaluvawigomum.scienceontheweb.net/deed_of_sale_of_land.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_5fd9a2430e697.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fararisujis.myartsonline.com/94891786364.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_f3a036a5bdcb44fa99974de7e90e6cee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/746406c6-dc7c-4eeb-8716-260f84178984/kodubufanuworilumej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977a4e24-5dd6-4980-9b32-add7dfb427e7/vomotivawotoboxikoto.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_3b5e6088530f4d21a40573d53c1c0ed9.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_90d10808f02a43cfaccb70275ad79fb9.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_dcc6d00d846b4e4c8411af55f71987b9.pdf?index=trueIn PDF document text
    • http://zepizevut.atwebpages.com/apologetics_study_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d70be1a7-4a7c-44fe-bb89-32ec848cd6bc/ncert_class_6_english_book_with_solution.pdfIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/what_is_the_importance_of_statistics_in_social_research.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 1540 bytes
SHA-256: 0a75a0bdab9063ca1514c94f1455f29474fa95dd7f78849186504a0f8c6231c2
font_01_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 5332 bytes
SHA-256: 7dd947415025e903fbd170296e706cef688787441d76ea5a16fc2580cd3b72f9
font_02_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 31360 bytes
SHA-256: f57733ca7d8356d5fcc5aa759072834e7375587b2e41dfa825169e654ebf6536
font_03_sfnt_off000163d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D6 16244 bytes
SHA-256: 6f32182622fa68a018df8a68d62ced31ce2993455a5610a69545e6df7858a60f

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