Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d878aa3c2d9891f…

MALICIOUS

PDF

84.5 KB Created: 2021-03-29 18:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: aee47852d104fa77a3c7326a528e1427 SHA-1: 1cec549e72fa93980d8bc6b79138785f9a16ba6c SHA-256: 6d878aa3c2d9891fa829d6aca00553316621f55e3e7da4c405f5e02453a56f53
66 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one heuristic specifically identifying it as a link farm designed to direct users to external sites. The ML classifier strongly indicates maliciousness, and the document body, though obfuscated, suggests a lure related to furnace maintenance. The presence of numerous URLs, many pointing to potentially disposable hosting, reinforces the malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://cdn-cms.f-static.net/uploads/4385231/normal_602ea7de28833.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427076/normal_6035201eb7a30.pdfIn PDF document text
    • http://tolosoludoxol.22web.org/periodontal_disease_and_cardiovascular_disease.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_604b00452dc12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/3IgsHNHpEfs/wb?keyword=how%20to%20prime%20a%20miller%20oil%20furnacePDF link annotation
    • https://s3.amazonaws.com/zarusegibitumet/graphic_design_is_my_passion_template.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_156c6a364a6445db80f0e7a3c832c2ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/dazinu.pdfIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_f1f310cf9b654bb7951d0cc4f5a72fde.pdf?index=trueIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_adc84ce7d68148bda98220eb905cf565.pdf?index=trueIn PDF document text
    • http://siwinigap.epizy.com/pool_billiards_game_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/honeywell_visionpro_th8000_user_guide.pdfIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_5a26e73dc2544b29bb8c4f2a6c96ea4f.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_c3f69a2d9c604ed5804985e861a21e90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/why_is_meditation_such_an_important_practice_in_buddhism.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_1b0803295dfb46d8ad7eb1a5d3642475.pdf?index=trueIn PDF document text
    • http://zemoxatovasoga.rf.gd/18697000963.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/kolavo.pdfIn PDF document text
    • https://6dca1d0c-b102-4aa4-a312-d013f97c39dd.filesusr.com/ugd/fb87fb_469f523b86614ca885a84c8abb726513.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/batiku/galafasoboginozutod.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_d68c45fb02764397a164e482322243b3.pdf?index=trueIn PDF document text
    • http://vumijasi.epizy.com/15607146595.pdfIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_7696ee370b7443dd85d9a2b2a4472cad.pdf?index=trueIn PDF document text
    • http://nolutujurevovi.epizy.com/early_childhood_education_articles.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_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 5036 bytes
SHA-256: d5a28860b1d6df4f5012a93151f51729d43d8a50f3b8c943e0561828391cc7bb
font_01_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 11084 bytes
SHA-256: f9745c5e2f08d324e3706bc09efb7faff56023db9601b6b67e4a1532d52f4ccf

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