Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42f799700810a8b…

MALICIOUS

PDF

101.2 KB Created: 2021-05-17 04:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1ba3ef48b501c3b5137cbee817c5035e SHA-1: df1fb4965f9a3c50ec8a2dbe54828903785ad1aa SHA-256: b42f799700810a8bc8b675f69bae1699dc5d9be8d027c8547b82b93e2d738ec2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9987

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/strik?utm_term=harry+potter+and+the+half+blood+prince+summary+shmoop PDF link annotation
    • https://nudezodubazez.weebly.com/uploads/1/3/1/1/131164524/f1430f.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/jamRhaL/katexozibebesinukojivix.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/hee1if1/descargar_dino_tamers_jurassic_riding_mmo.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/fJrayhf/one_word_caption_for_couple_pic.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/suhgchM/kawasaki_pneumatic_tools.pdfIn PDF document text
    • https://gobezovix.weebly.com/uploads/1/3/1/4/131454522/4738597.pdfIn PDF document text
    • https://borikalubir.weebly.com/uploads/1/3/2/6/132681749/vapukanifaxivevojoja.pdfIn PDF document text
    • https://cdn.sqhk.co/livaxipovage/UDR4gcs/94709523198.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/veguratade_nuwijinemo_salogudesizadik.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/kMgepkV/best_drama_games_online_learning.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/3259281860.pdfIn PDF document text
    • http://gejikojaki.scienceontheweb.net/81634980674.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/TygjPhf/chainsaw_sharpening_places_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/igfkZif/pexodomavulejekamotemivez.pdfIn PDF document text
    • https://cdn.sqhk.co/nijazulagoza/Djadii0/dictionary_app_download_english_to_tamil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_2c4ec81c717442449ac58e403ff8a171.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/bolelipejolomamu.pdfIn PDF document text
    • http://kemesid.onlinewebshop.net/degexipafudujanefurerul.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/fedomuluruzomariwolodu.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_574fdc2349ea4ed893e8dcd2687de8d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sisaxu/vodibo.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/what_is_the_mendels_second_law_of_inheritance.pdfIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_21b6720603474c9987d839df797e70db.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E80 5480 bytes
SHA-256: 2c74ea2216543ab70b7f178a08c28c839ba0fae47c88eb2107621f2b94156c5e
font_01_sfnt_off000150ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EF 11692 bytes
SHA-256: 8763d1f970b242c91b40d7c81dc10167662479096dfa3066149f6f972a75ca06
font_02_sfnt_off00017832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17832 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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