Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c74a6f31b376cdf…

MALICIOUS

PDF

78.0 KB Created: 2021-04-28 23:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 37e228121af21601f318b69c6512b328 SHA-1: 2c9b27c16dfcb6e2dfd26fde893bdeec2d868395 SHA-256: 8c74a6f31b376cdf7f5eb96eca935153a9fb5f3fbb4096e651ca66153d02467a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to the embedded links, suggesting a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=transistor+circuit+analysis+and+design+pdf In PDF document text
    • http://tobowajoveza.iblogger.org/ronevinedaxavunonesox.pdfIn PDF document text
    • http://raraveluwogevuw.mypressonline.com/pdf_to_word_converter_software_download_for_windows_8.pdfIn PDF document text
    • http://zagodutaf.getenjoyment.net/juvejerisuwawujepa.pdfIn PDF document text
    • http://gugudavi.22web.org/used_yamaha_dirt_bikes_for_sale_125cc.pdfIn PDF document text
    • http://presentinsta.online/6422862559618gch.pdfIn PDF document text
    • http://straponartist.com/holmes_ultrasonic_cool_mist_humidifier_how_to_usekdf3l.pdfIn PDF document text
    • http://podarokinsta365.site/26771275779vux7o.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/amar_ujala_epaper_deoria.pdfIn PDF document text
    • http://tukudetu.iblogger.org/cuanto_es_5_9_pies_en_centimetros.pdfIn PDF document text
    • http://urolog.xyz/asme_b16._9p858u.pdfIn PDF document text
    • http://libralab.digital/sugared_pecans_nutritional_informationj63m1.pdfIn PDF document text
    • http://narosisebono.22web.org/cherry_bomb_performance_ver._nct_127_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nomapalugaji.epizy.com/82271191829.pdfIn PDF document text
    • http://warufadul.rf.gd/basebugeguwi.pdfIn PDF document text
    • http://sixijoras.epizy.com/garfield_movie_in_tamil_tamilrockers_hd.pdfIn PDF document text
    • http://govasawoti.epizy.com/siviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e3db5e8-b8fe-4a4e-ba7e-843e3ac984d7/graphs_of_reciprocal_trig_functions_worksheet.pdfIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_a3547ba0ea844ea2854de63b25d1ae4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa78affb-f1d6-47b0-9b9a-250d6d267db0/59693653938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbeba835-dcc8-4895-9b59-aebf2185158c/ryobi_10_portable_table_saw_dado_blade.pdfIn PDF document text
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_1d21cc38c17446de90e6aca8dfe89877.pdf?index=trueIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_ecdb365a48604e9ca1c2bf9bbeb1045b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92998f8a-fc1a-409f-8da9-43e7e5a62528/87029793744.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_9654a9ab5d8c4bdea8c6610cac383215.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 5376 bytes
SHA-256: afd3072f8903a4b70b10b57a9fa3746758322765e4167c5ea81f8c4bceec75c2
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 11344 bytes
SHA-256: 51e8b63dbd4a2e7b5e51908fe605680d95fea19e8a7079fd3e6991eb0be75861