Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e7604b2b8659e8…

MALICIOUS

PDF

89.9 KB Created: 2021-03-17 10:27:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 271f8274e3b6644308306467156d331a SHA-1: d929c3a97f638a6c876809ece7df12b566890e00 SHA-256: 62e7604b2b8659e87f9ac9f27310c93e884ac2e9ce14f5a02c33f344a9493004
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs and the link farm characteristic suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=oxidation+number+of+cl+in+hg2cl2 PDF link annotation
    • https://dubibezu.weebly.com/uploads/1/3/1/4/131453247/371165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_602c1da2cc436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496153/normal_602ff945f06ca.pdfIn PDF document text
    • https://jumaxejew.weebly.com/uploads/1/3/1/6/131606465/74655b0aa5621e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443371/normal_601c6569e3dc8.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/vulunif.pdfIn PDF document text
    • http://sazavenegot.22web.org/58680754546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_5fd5f892a9cdd.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/sotodubum.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/business_studies_class_11_question_papers.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/tetenifeme/fifth_harmony_worth_it_music_video.pdfIn PDF document text
    • http://pevivudawof.epizy.com/balo_da_informatica_teresina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ad32a6-6df7-453e-a784-87566a5078a4/different_types_of_wood_joints_and_their_uses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff042b3-2eea-4ec3-879f-fe316ae05603/refesaki.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/beowulf_full_movie_free_download_in_hindi.pdfIn PDF document text
    • http://pakefuvusenoz.rf.gd/tinorawosusibut.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/besinijuzewotifabowakuz.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/l_t_company_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/naxodewuwuvewuwas.pdfIn PDF document text
    • http://kaxinezapur.epizy.com/alouatta_caraya.pdfIn PDF document text
    • http://xemusiginusepiz.rf.gd/bepezikewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/363f1daa-afa8-4d9e-9d2a-c106dddb4282/how_to_remove_aquasource_shower_faucet.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/73264430316.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_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 5624 bytes
SHA-256: 0f3318f48611bf3e26c12ab1627ab93e225bde904107ed3558e7f9f720161f78
font_01_sfnt_off00012dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 12612 bytes
SHA-256: a11c81db64253969793c1a60cb5d877680e13f76373699f44d784acb04609578

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