Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bce5d1ff93999f9…

MALICIOUS

PDF

92.6 KB Created: 2021-03-20 00:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 4f0278ee55592dfa996937e592800a3e SHA-1: 5beab05287be12527eee56413897373aa77b771a SHA-256: 7bce5d1ff93999f9a6bab28aed47f538cdcacac5aa09411c28d34300d4b75a85
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan activity. While no scripts were extracted, the PDF structure and embedded URLs suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=chapter+11+cell+communication+reading+guide+key PDF link annotation
    • http://mimivamefigupe.sportsontheweb.net/fafevodinebanemi.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/taxurobafoweromuz.pdfIn PDF document text
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/1154162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_601dddd3adaf7.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/85800775429.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476569/normal_5ffd1ad7d96f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455198/normal_604a2c91155c5.pdfIn PDF document text
    • https://kiteginizi.weebly.com/uploads/1/3/1/8/131871518/8149777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_cf9470abf14147f3a2c56cd2c1a61d63.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c370bf-da29-4f2f-bdc0-093d246d90db/onn_32_mile_walkie_talkie_reviews.pdfIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_de27534c2f5d4a1c994512062c94ec31.pdf?index=trueIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_69a3d09f619b46eeb5c8523123fe8fa0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b5ba1d-4a5c-4977-9705-babcaad4c638/kesetaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8741e7e8-0617-43eb-9679-48f2b99b3071/bisowevakuxepixi.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_2ff994eb2f934d1faa743bc93259e9bd.pdf?index=trueIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_cb5904b6ad8a48cfaf501caf15789694.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e92681-e516-4a90-a91d-e9e9d3f24f55/58719713534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a3af59-ca87-430a-a91e-dac4856bcad3/41703258755.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_f55cbc42e92947169671f4af90f6b88f.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_63f0cbdefbf2475f9fb65521e279f2c0.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_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 5432 bytes
SHA-256: da10f031e634b182cfd0704df2b42afed435153a538ec1a296fcc87dbd5fc932
font_01_sfnt_off00013cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEE 11676 bytes
SHA-256: dad105f3b574fbf0d853d9fd8f1bd0db6cd028aeaba5b9f22709a4e9c81f34fe