Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a564e17be5c7939…

MALICIOUS

PDF

101.7 KB Created: 2021-04-25 21:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2d4c8f43591ba6259909ef13af1a4c04 SHA-1: b5c9bde30732ee3e0e5091758304e78834a31f4f SHA-256: 5a564e17be5c79391eedd3bf238fd6aca88fb4fc73489c09fa08e7608a31100c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains a link farm with 25 external links, many pointing to disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and a link farm indicates a likely attempt to redirect users to malicious sites, potentially for malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://jumiwimov.ru/strik?utm_term=roku+smart+soundbar+black+friday+2020 PDF link annotation
    • http://domifonupesif.iblogger.org/35485133630.pdfIn PDF document text
    • https://cdn.sqhk.co/xojugako/ifiigLw/14968618974.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/iigepCJ/gojileki.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/hiOAshf/dj_mix_pads_2_remix_version.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/f1Ujche/best_offline_gps_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/phc3jcQ/45477183620.pdfIn PDF document text
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/6064033.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/C3dhb14/81223633882.pdfIn PDF document text
    • https://xizadububexo.weebly.com/uploads/1/3/4/5/134595199/1819653.pdfIn PDF document text
    • https://pokotozumunas.weebly.com/uploads/1/3/1/4/131453498/kexuselajoge-wijep-dizitawuwusu.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/riwojin.pdfIn PDF document text
    • https://cdn.sqhk.co/fexilejedit/cghjhBN/megamind_characters_bernard.pdfIn PDF document text
    • http://tajizomekoza.iblogger.org/scales_chords_arpeggios_james_bastien.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
    • http://kidiwafupilisu.rf.gd/14603417937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62651c4-5803-463c-8204-54669d08df7c/43298896988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44aee21-5f22-42f6-b254-52cb45711f17/how_much_does_a_garage_door_keypad_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201e289a-fed6-4f58-adc0-4869fbb635a5/2003_cadillac_cts_service_stability_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a6c1a1-5b4b-4189-b029-f6a667d90e86/how_to_thread_singer_promise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/049d9f33-fa24-4ae8-af25-ffdac46e2846/how_to_use_t_fal_mini_deep_fryer.pdfIn PDF document text
    • http://rilasiwawizumo.rf.gd/16736310240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ae129f-ed3b-4185-b58f-63031cbbf7f3/84703987851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f86d6c-cf29-4b96-bb3e-06a682a55c55/kotemutegubejosepap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c6e566-b52f-4a7c-9b8f-55c22b1c53e6/sopa_de_letras_en_ingles_para_nios_de_primaria_para_imprimir.pdfIn PDF document text
    • http://gogobat.epizy.com/carding_machine_electrical_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a34e56f-1aaa-462f-9bd1-8990e8f6fa6c/xalubipopivu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14008 5516 bytes
SHA-256: 22ebacd1c88f347e2bb88441ea1dad1a184ad332acf89ddddbae38adc88b6d63
font_01_sfnt_off000152b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B4 12012 bytes
SHA-256: 5819c95ed141392f7613533185bb72728e75c9b89196b4dd5ba084b145c04f28
font_02_sfnt_off00017b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B1E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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