Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cb4c0427af07a4…

MALICIOUS

PDF

79.8 KB Created: 2021-03-14 22:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c4ad6e220eb36a5af23abd4d51df988b SHA-1: 6a861a6ca0bc01cc46e56f662ed86fde7bc247aa SHA-256: b8cb4c0427af07a429cbf0718e5c39dc6f7e303bbbd6595043001577062f6732
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary external URI points to a site related to 'seekers notes hidden mystery free rubies', likely a lure to entice users to click through to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://druttle.ru/wix?keyword=seekers+notes+hidden+mystery+free+rubies PDF link annotation
    • https://cdn.sqhk.co/napoxanu/jfZjhkw/vibiporitijubuvaxog.pdfIn PDF document text
    • https://cdn.sqhk.co/fefoseto/jhYUHhc/cytus_2_alice.pdfIn PDF document text
    • http://jezojarugeboz.22web.org/dead_space_4_free_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/EroibA6/is_yapsnapp_safe.pdfIn PDF document text
    • https://cdn.sqhk.co/puroneruk/jaIvToJ/penulojebim.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/dWthdo9/hello_neighbor_act_1_guide_xbox.pdfIn PDF document text
    • http://lemovifi.iblogger.org/mosof.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/goVigja/bupipenowokiputivadajuta.pdfIn PDF document text
    • https://cdn.sqhk.co/solaxutom/EgftBWs/limbo_amine_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/2pOhifJ/diversion_dance_collective.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/haMBhel/58289206203.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_6dc782cb3e9e4a3393c246c9a43d0e7e.pdf?index=trueIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_020e5f56074f4defb8dd3c47a24a7154.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_98518efbd9f24c4899686aab567ccb06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3a39f37-aac0-476f-9ba9-986e21d2b993/94027059567.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_89478853a4b546d59fafc824f7d432e1.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_0a93727850064a82be0dd65d33ea3679.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30ece53b-2cc9-4f62-af9e-f3f5788a5f4c/karen_m_mcmanus_one_of_us_is_lying_series.pdfIn PDF document text
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_cbd974b4ff72418ab91a3539dbce27b6.pdf?index=trueIn PDF document text
    • http://dadagax.epizy.com/native_american_culture_before_colonization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1350081-1033-45df-b6ea-1f46333e14b5/frosty_the_snowman_movie_1969_where_to_watch.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_e7f883cbdc9d40adb1e916c3e46a6016.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_80c5c7b788604d73992b7eee62fdec8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee263aa9-e254-48e3-80a4-52a36b22c68a/how_much_does_an_ansul_fire_suppression_system_cost.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_1df66003ce784af7a1483d887045bf5b.pdf?index=trueIn PDF document text
    • http://wazuvit.rf.gd/19474757247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0563a74d-563b-44e1-b4fe-1ce5de77504e/bhagavad_gita_in_sanskrit_hindi_and_english.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_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 5312 bytes
SHA-256: 4c4824e19406aefee10b5301a24ae52c7c8340cddeb6b59bf1f40d8e3bc87286
font_01_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 11276 bytes
SHA-256: c478d768cab133a6cc9de481fc1743e540dc69bd53cfc9d8d7f4aca119c07d08