Malicious PDF — malware analysis report

Static analysis result for SHA-256 358f882c702607f7…

MALICIOUS

PDF

97.1 KB Created: 2021-03-13 16:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 34793aa69572901bdbf83d45ff2d2de6 SHA-1: 360824f9fed91223e2c7d32fba8cef63d1ab7def SHA-256: 358f882c702607f7fffc0387524bae893e47c709600a5e57facaae9a702902b4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9961

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://vilenefex.ru/wix?keyword=mary+pat+fisher+living+religions+9th+edition+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375357/normal_6035eb8589d8c.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/momoporedizok_joran_woxonavawaged.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_6040f477e1f4e.pdfIn PDF document text
    • http://wedasuf.getenjoyment.net/2166863423.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476446/normal_5ff8dc297cbec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412584/normal_5fc71015d309d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_60311331805f2.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/geputikepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_600d412e612f4.pdfIn PDF document text
    • https://zajasonasijo.weebly.com/uploads/1/3/4/6/134627958/wopanirafatak.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/lomogidumizegabokapiriv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fe1698a7bc87.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/6869bd.pdfIn PDF document text
    • https://dekamukovesu.weebly.com/uploads/1/3/5/3/135324216/tamikiroxuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413866/normal_5fc929a37d83f.pdfIn PDF document text
    • http://xizugef.medianewsonline.com/98156603248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424010/normal_5fc86efeca2e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_97428b516d304b2da59b19160491116f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0876be9-92ae-4124-adf5-6d8d0ff48010/nivubusibasazokonoxogosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0b18aa-485b-40cf-8418-749a87e064c5/what_genre_is_miss_peregrines.pdfIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_84e0f646a66540ff9055af5ea9854e9c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f97a044b-5e5c-4d4b-a2a8-bd5377c0adf2/used_john_deere_zero_turn_mowers_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d916f8-736c-4ea6-984f-890d373496fa/is_rigid_as_good_as_dewalt.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_9c18d5041ead42b6851dfe9782afcced.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_86a9543ffd8d4c00a02208811b01a7c2.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_e44cb6bd5cd24a90ade533316bb20182.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c6d8de4-61af-491e-9ba1-ebf5509a315a/the_rational_male_preventive_medicine.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_off00013960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13960 5628 bytes
SHA-256: 5f9e8be6fa34416428c9997f5011d985e5cff76926169bc92334eda159184f51
font_01_sfnt_off00014c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9E 11832 bytes
SHA-256: 1a881718c3fb4a08b4b8d843db89c2cc1bb91870817a5fa60307a7faa2e73381