Malicious PDF — malware analysis report

Static analysis result for SHA-256 e245ebaccdcb196d…

MALICIOUS

PDF

132.3 KB Created: 2021-04-01 04:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5e75bda3f2d1edcd84ba544e39034848 SHA-1: a8dce71618c66b37de716c68c9c285f37830ea88 SHA-256: e245ebaccdcb196df9482a1d7c0b4f36bbed464baf8d82475ca376c4477008fb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO scam. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://soxebez.ru/strik?utm_term=simply+keto+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449987/normal_603c5328201c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482880/normal_5ffcd22b5eb20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_6047ce2bb7c0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421477/normal_6002ef2b2bbdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459322/normal_6037d3f9eac02.pdfIn PDF document text
    • http://bositozibab.getenjoyment.net/english_for_business_communication_free_download.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/kandungan_minuman_isotonik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489593/normal_6025442db9a71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_6064f923e46de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365545/normal_5ffcab9639922.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/janazobokixakowaf.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/solid_waste_management_plan_philippines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393029/normal_5ff174122cb1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503214/normal_5fcf2ed36af83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxuzaridob.onlinewebshop.net/exercises_in_basic_modern_russian_grammar.pdfIn PDF document text
    • http://nudagimanefej.atwebpages.com/wolaxibavesugokoguragana.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_88f4329435524858bc745422645616d7.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_a65c647aeac24345b5718ffc87ef66b1.pdf?index=trueIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_cc6ef6ab5c3b42ab96438027c2c6c65c.pdf?index=trueIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_3b7bdc2f74884b1c95e2ab68df89ddfd.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_09445bdb815f4a10a076f4a55d4b4c08.pdf?index=trueIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_18f9fe5997bb4e95b4d1708e5d13b700.pdf?index=trueIn PDF document text
    • https://4192d618-ecd7-4808-8485-efd4d6773ded.filesusr.com/ugd/17a5db_668a86ae7617416f8fe4cc84302b9ee7.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_144965e7768345a8ba80513f4e406616.pdf?index=trueIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_81efd062a23a4a1da0b694803d70d186.pdf?index=trueIn PDF document text
    • http://wadoromutisagar.myartsonline.com/abbie_hoffman_steal_this_book.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_off0001c974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C974 4892 bytes
SHA-256: f11977958eec337be5c0791aa101064315ecede252236aa3a679f2b7090bd508
font_01_sfnt_off0001da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA13 12244 bytes
SHA-256: 74817b895aa26bb23d778145dc6e9864f14de8f58a2b679e257f5bec09cf8ff3

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