Malicious PDF — malware analysis report

Static analysis result for SHA-256 956bec1bf687f7a3…

MALICIOUS

PDF

96.5 KB Created: 2021-03-21 09:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 209cd46efe44e58647362e7cc36eb600 SHA-1: 5d10eae9a4629470dfa9f0b1948bcbcdd50d65c3 SHA-256: 956bec1bf687f7a3b3012d820567f6a2b4e015389d81ed82952d7736fb5363d6
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 0.9998

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://resalured.ru/strik?utm_term=how+do+you+say+this+is+the+way+in+mandalorian PDF link annotation
    • http://drive4mclanemilwaukee.com/983295052631rz00.pdfIn PDF document text
    • http://storeplus.pro/kuxutaruzisivaluxevufewoqk7.pdfIn PDF document text
    • https://jefamiwufilidiv.weebly.com/uploads/1/3/1/4/131409158/09cff122d7f88.pdfIn PDF document text
    • https://xiligori.weebly.com/uploads/1/3/1/4/131411896/1413743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_605026d75ea0c.pdfIn PDF document text
    • http://znohist.site/android_1_fifa_18_mod_apk6dngn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480886/normal_5fecc65b142f2.pdfIn PDF document text
    • https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/75168b7.pdfIn PDF document text
    • https://kiniwotonupit.weebly.com/uploads/1/3/0/7/130776343/8614236.pdfIn PDF document text
    • http://luminar4-download.xyz/78505120358kcpum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_602f1c52ae585.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d69d9d-60ef-4c04-bbfe-5068c9c2d6d7/the_modern_corporation_and_private_property_1932.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_53683686b39848a791cc5262f9258d58.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_dcdaf718959544a792f1050b3930cf97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58bec97-fb15-4cf8-a101-6b2125545ced/tusopofibevino.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_ac5588acd2ec4477897944a236544107.pdf?index=trueIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_dbcf925464db4532b7ae0d26ac3ee8ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a02b1a-1c61-4d6c-91cd-275936188fcd/my_dishwasher_leaks_from_underneath.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4354ba-bea7-4025-abbf-6f49d9264f6f/13101887901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf41f0c-f0e3-495a-8a3e-df295895ab8b/harry_potter_book_1_quiz_buzzfeed.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_off000139a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A0 5220 bytes
SHA-256: c93d7e9a6ca4ce7a50e202a3860afaa6fcc8adcc1a99b7734bbdbbf612918a54
font_01_sfnt_off00014b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B44 12196 bytes
SHA-256: 9107d0e165a46e4a2655a6cda64d0dd9295f92da0afdf724287898d4b0ce64c4